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Finding the Fourth Proportional to 624.20, 861.20 and 402.76

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Solution

The fourth proportional to 624.20, 861.20 and 402.76 is: 555.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    624.20 : 861.20 = 402.76 : x
  2. Step 2: Convert to fraction form
    624.20/861.20 = 402.76/x
  3. Step 3: Cross multiply
    624.20x = 861.20 × 402.76
  4. Step 4: Simplify right side
    624.20x = 346,852.61
  5. Step 5: Solve for x
    x = 346,852.61/624.20
  6. Step 6: Final answer
    x = 555.68

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Find fourth proportional to 312.10, 430.60 and 201.38
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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.