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Finding the Fourth Proportional to 130,139.60, 195,209.40 and 85,816.40

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Solution

The fourth proportional to 130,139.60, 195,209.40 and 85,816.40 is: 128,724.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,139.60 : 195,209.40 = 85,816.40 : x
  2. Step 2: Convert to fraction form
    130,139.60/195,209.40 = 85,816.40/x
  3. Step 3: Cross multiply
    130,139.60x = 195,209.40 × 85,816.40
  4. Step 4: Simplify right side
    130,139.60x = 16,752,167,954.16
  5. Step 5: Solve for x
    x = 16,752,167,954.16/130,139.60
  6. Step 6: Final answer
    x = 128,724.60

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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.