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Finding the Fourth Proportional to 139,564.80, 209,282.40 and 60,638.40

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Solution

The fourth proportional to 139,564.80, 209,282.40 and 60,638.40 is: 90,929.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,564.80 : 209,282.40 = 60,638.40 : x
  2. Step 2: Convert to fraction form
    139,564.80/209,282.40 = 60,638.40/x
  3. Step 3: Cross multiply
    139,564.80x = 209,282.40 × 60,638.40
  4. Step 4: Simplify right side
    139,564.80x = 12,690,549,884.16
  5. Step 5: Solve for x
    x = 12,690,549,884.16/139,564.80
  6. Step 6: Final answer
    x = 90,929.45

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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.