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Finding the Fourth Proportional to 918.73, 1,260.11 and 853.12

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Solution

The fourth proportional to 918.73, 1,260.11 and 853.12 is: 1,170.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.73 : 1,260.11 = 853.12 : x
  2. Step 2: Convert to fraction form
    918.73/1,260.11 = 853.12/x
  3. Step 3: Cross multiply
    918.73x = 1,260.11 × 853.12
  4. Step 4: Simplify right side
    918.73x = 1,075,025.04
  5. Step 5: Solve for x
    x = 1,075,025.04/918.73
  6. Step 6: Final answer
    x = 1,170.12

Related Problems

Find fourth proportional to 459.37, 630.06 and 426.56
Half scale
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Double scale
Find fourth proportional to 919.73, 1,261.48 and 854.12
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.