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Finding the Fourth Proportional to 130,417.20, 195,625.80 and 86,641.20

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Solution

The fourth proportional to 130,417.20, 195,625.80 and 86,641.20 is: 129,961.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,417.20 : 195,625.80 = 86,641.20 : x
  2. Step 2: Convert to fraction form
    130,417.20/195,625.80 = 86,641.20/x
  3. Step 3: Cross multiply
    130,417.20x = 195,625.80 × 86,641.20
  4. Step 4: Simplify right side
    130,417.20x = 16,949,254,062.96
  5. Step 5: Solve for x
    x = 16,949,254,062.96/130,417.20
  6. Step 6: Final answer
    x = 129,961.80

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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.