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Finding the Fourth Proportional to 920.46, 1,272.02 and 684.76

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Solution

The fourth proportional to 920.46, 1,272.02 and 684.76 is: 946.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.46 : 1,272.02 = 684.76 : x
  2. Step 2: Convert to fraction form
    920.46/1,272.02 = 684.76/x
  3. Step 3: Cross multiply
    920.46x = 1,272.02 × 684.76
  4. Step 4: Simplify right side
    920.46x = 871,028.42
  5. Step 5: Solve for x
    x = 871,028.42/920.46
  6. Step 6: Final answer
    x = 946.30

Related Problems

Find fourth proportional to 460.23, 636.01 and 342.38
Half scale
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Double scale
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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.