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Finding the Fourth Proportional to 674.64, 930.15 and 556.20

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Solution

The fourth proportional to 674.64, 930.15 and 556.20 is: 766.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.64 : 930.15 = 556.20 : x
  2. Step 2: Convert to fraction form
    674.64/930.15 = 556.20/x
  3. Step 3: Cross multiply
    674.64x = 930.15 × 556.20
  4. Step 4: Simplify right side
    674.64x = 517,349.43
  5. Step 5: Solve for x
    x = 517,349.43/674.64
  6. Step 6: Final answer
    x = 766.85

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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.