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Finding the Fourth Proportional to 624.79, 865.90 and 615.43

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Solution

The fourth proportional to 624.79, 865.90 and 615.43 is: 852.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.79 : 865.90 = 615.43 : x
  2. Step 2: Convert to fraction form
    624.79/865.90 = 615.43/x
  3. Step 3: Cross multiply
    624.79x = 865.90 × 615.43
  4. Step 4: Simplify right side
    624.79x = 532,893.43
  5. Step 5: Solve for x
    x = 532,893.43/624.79
  6. Step 6: Final answer
    x = 852.92

Related Problems

Find fourth proportional to 312.39, 432.95 and 307.71
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 (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.