Home / 21,129.60-29,157.95-11,569.31

Finding the Fourth Proportional to 21,129.60, 29,157.95 and 11,569.31

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Solution

The fourth proportional to 21,129.60, 29,157.95 and 11,569.31 is: 15,965.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.60 : 29,157.95 = 11,569.31 : x
  2. Step 2: Convert to fraction form
    21,129.60/29,157.95 = 11,569.31/x
  3. Step 3: Cross multiply
    21,129.60x = 29,157.95 × 11,569.31
  4. Step 4: Simplify right side
    21,129.60x = 337,337,362.51
  5. Step 5: Solve for x
    x = 337,337,362.51/21,129.60
  6. Step 6: Final answer
    x = 15,965.16

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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.