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Finding the Fourth Proportional to 139,439.70, 209,159.55 and 129,816.90

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Solution

The fourth proportional to 139,439.70, 209,159.55 and 129,816.90 is: 194,725.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,439.70 : 209,159.55 = 129,816.90 : x
  2. Step 2: Convert to fraction form
    139,439.70/209,159.55 = 129,816.90/x
  3. Step 3: Cross multiply
    139,439.70x = 209,159.55 × 129,816.90
  4. Step 4: Simplify right side
    139,439.70x = 27,152,444,386.40
  5. Step 5: Solve for x
    x = 27,152,444,386.40/139,439.70
  6. Step 6: Final answer
    x = 194,725.35

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1.5x scale

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.