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Finding the Fourth Proportional to 641.48, 885.24 and 346.74

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Solution

The fourth proportional to 641.48, 885.24 and 346.74 is: 478.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.48 : 885.24 = 346.74 : x
  2. Step 2: Convert to fraction form
    641.48/885.24 = 346.74/x
  3. Step 3: Cross multiply
    641.48x = 885.24 × 346.74
  4. Step 4: Simplify right side
    641.48x = 306,946.38
  5. Step 5: Solve for x
    x = 306,946.38/641.48
  6. Step 6: Final answer
    x = 478.50

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Double scale
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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.