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Finding the Fourth Proportional to 663.61, 915.38 and 477.35

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Solution

The fourth proportional to 663.61, 915.38 and 477.35 is: 658.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.61 : 915.38 = 477.35 : x
  2. Step 2: Convert to fraction form
    663.61/915.38 = 477.35/x
  3. Step 3: Cross multiply
    663.61x = 915.38 × 477.35
  4. Step 4: Simplify right side
    663.61x = 436,956.64
  5. Step 5: Solve for x
    x = 436,956.64/663.61
  6. Step 6: Final answer
    x = 658.45

Related Problems

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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.