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Finding the Fourth Proportional to 139,725.10, 209,726.70 and 64,862.20

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Solution

The fourth proportional to 139,725.10, 209,726.70 and 64,862.20 is: 97,357.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,725.10 : 209,726.70 = 64,862.20 : x
  2. Step 2: Convert to fraction form
    139,725.10/209,726.70 = 64,862.20/x
  3. Step 3: Cross multiply
    139,725.10x = 209,726.70 × 64,862.20
  4. Step 4: Simplify right side
    139,725.10x = 13,603,335,160.74
  5. Step 5: Solve for x
    x = 13,603,335,160.74/139,725.10
  6. Step 6: Final answer
    x = 97,357.85

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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.