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Finding the Fourth Proportional to 21,295.92, 29,385.54 and 12,342.90

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Solution

The fourth proportional to 21,295.92, 29,385.54 and 12,342.90 is: 17,031.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,295.92 : 29,385.54 = 12,342.90 : x
  2. Step 2: Convert to fraction form
    21,295.92/29,385.54 = 12,342.90/x
  3. Step 3: Cross multiply
    21,295.92x = 29,385.54 × 12,342.90
  4. Step 4: Simplify right side
    21,295.92x = 362,702,781.67
  5. Step 5: Solve for x
    x = 362,702,781.67/21,295.92
  6. Step 6: Final answer
    x = 17,031.56

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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.