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Finding the Fourth Proportional to 139,947.20, 209,920.80 and 86,681.60

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Solution

The fourth proportional to 139,947.20, 209,920.80 and 86,681.60 is: 130,022.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,947.20 : 209,920.80 = 86,681.60 : x
  2. Step 2: Convert to fraction form
    139,947.20/209,920.80 = 86,681.60/x
  3. Step 3: Cross multiply
    139,947.20x = 209,920.80 × 86,681.60
  4. Step 4: Simplify right side
    139,947.20x = 18,196,270,817.28
  5. Step 5: Solve for x
    x = 18,196,270,817.28/139,947.20
  6. Step 6: Final answer
    x = 130,022.40

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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.