Home / 21,639.06-29,862-12,686.70

Finding the Fourth Proportional to 21,639.06, 29,862 and 12,686.70

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Solution

The fourth proportional to 21,639.06, 29,862 and 12,686.70 is: 17,507.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,639.06 : 29,862 = 12,686.70 : x
  2. Step 2: Convert to fraction form
    21,639.06/29,862 = 12,686.70/x
  3. Step 3: Cross multiply
    21,639.06x = 29,862 × 12,686.70
  4. Step 4: Simplify right side
    21,639.06x = 378,850,235.40
  5. Step 5: Solve for x
    x = 378,850,235.40/21,639.06
  6. Step 6: Final answer
    x = 17,507.70

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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.