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Finding the Fourth Proportional to 139,539.90, 209,358.45 and 60,710.70

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Solution

The fourth proportional to 139,539.90, 209,358.45 and 60,710.70 is: 91,087.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,539.90 : 209,358.45 = 60,710.70 : x
  2. Step 2: Convert to fraction form
    139,539.90/209,358.45 = 60,710.70/x
  3. Step 3: Cross multiply
    139,539.90x = 209,358.45 × 60,710.70
  4. Step 4: Simplify right side
    139,539.90x = 12,710,298,050.42
  5. Step 5: Solve for x
    x = 12,710,298,050.42/139,539.90
  6. Step 6: Final answer
    x = 91,087.19

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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.