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Finding the Fourth Proportional to 139,663.55, 209,507.68 and 39,821.60

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Solution

The fourth proportional to 139,663.55, 209,507.68 and 39,821.60 is: 59,735.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,663.55 : 209,507.68 = 39,821.60 : x
  2. Step 2: Convert to fraction form
    139,663.55/209,507.68 = 39,821.60/x
  3. Step 3: Cross multiply
    139,663.55x = 209,507.68 × 39,821.60
  4. Step 4: Simplify right side
    139,663.55x = 8,342,931,454.10
  5. Step 5: Solve for x
    x = 8,342,931,454.10/139,663.55
  6. Step 6: Final answer
    x = 59,735.92

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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.