Home / 21,129.76-29,159.40-11,569.48

Finding the Fourth Proportional to 21,129.76, 29,159.40 and 11,569.48

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Solution

The fourth proportional to 21,129.76, 29,159.40 and 11,569.48 is: 15,966.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.76 : 29,159.40 = 11,569.48 : x
  2. Step 2: Convert to fraction form
    21,129.76/29,159.40 = 11,569.48/x
  3. Step 3: Cross multiply
    21,129.76x = 29,159.40 × 11,569.48
  4. Step 4: Simplify right side
    21,129.76x = 337,359,095.11
  5. Step 5: Solve for x
    x = 337,359,095.11/21,129.76
  6. Step 6: Final answer
    x = 15,966.06

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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.