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Finding the Fourth Proportional to 139,607.80, 209,411.70 and 83,620.60

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Solution

The fourth proportional to 139,607.80, 209,411.70 and 83,620.60 is: 125,430.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,607.80 : 209,411.70 = 83,620.60 : x
  2. Step 2: Convert to fraction form
    139,607.80/209,411.70 = 83,620.60/x
  3. Step 3: Cross multiply
    139,607.80x = 209,411.70 × 83,620.60
  4. Step 4: Simplify right side
    139,607.80x = 17,511,132,001.02
  5. Step 5: Solve for x
    x = 17,511,132,001.02/139,607.80
  6. Step 6: Final answer
    x = 125,430.90

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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.