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Finding the Fourth Proportional to 918.76, 1,267.68 and 520.44

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Solution

The fourth proportional to 918.76, 1,267.68 and 520.44 is: 718.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.76 : 1,267.68 = 520.44 : x
  2. Step 2: Convert to fraction form
    918.76/1,267.68 = 520.44/x
  3. Step 3: Cross multiply
    918.76x = 1,267.68 × 520.44
  4. Step 4: Simplify right side
    918.76x = 659,751.38
  5. Step 5: Solve for x
    x = 659,751.38/918.76
  6. Step 6: Final answer
    x = 718.09

Related Problems

Find fourth proportional to 459.38, 633.84 and 260.22
Half scale
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Double scale
Find fourth proportional to 919.76, 1,269.06 and 521.44
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.