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Finding the Fourth Proportional to 21,248.70, 31,815.45 and 16,640.70

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Solution

The fourth proportional to 21,248.70, 31,815.45 and 16,640.70 is: 24,915.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,248.70 : 31,815.45 = 16,640.70 : x
  2. Step 2: Convert to fraction form
    21,248.70/31,815.45 = 16,640.70/x
  3. Step 3: Cross multiply
    21,248.70x = 31,815.45 × 16,640.70
  4. Step 4: Simplify right side
    21,248.70x = 529,431,358.82
  5. Step 5: Solve for x
    x = 529,431,358.82/21,248.70
  6. Step 6: Final answer
    x = 24,915.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.