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Finding the Fourth Proportional to 139,436.80, 209,155.20 and 34,254.40

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Solution

The fourth proportional to 139,436.80, 209,155.20 and 34,254.40 is: 51,381.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,436.80 : 209,155.20 = 34,254.40 : x
  2. Step 2: Convert to fraction form
    139,436.80/209,155.20 = 34,254.40/x
  3. Step 3: Cross multiply
    139,436.80x = 209,155.20 × 34,254.40
  4. Step 4: Simplify right side
    139,436.80x = 7,164,485,882.88
  5. Step 5: Solve for x
    x = 7,164,485,882.88/139,436.80
  6. Step 6: Final answer
    x = 51,381.60

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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.