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Finding the Fourth Proportional to 13,689.76, 20,526.45 and 6,655.93

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Solution

The fourth proportional to 13,689.76, 20,526.45 and 6,655.93 is: 9,979.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.76 : 20,526.45 = 6,655.93 : x
  2. Step 2: Convert to fraction form
    13,689.76/20,526.45 = 6,655.93/x
  3. Step 3: Cross multiply
    13,689.76x = 20,526.45 × 6,655.93
  4. Step 4: Simplify right side
    13,689.76x = 136,622,614.35
  5. Step 5: Solve for x
    x = 136,622,614.35/13,689.76
  6. Step 6: Final answer
    x = 9,979.91

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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.