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Finding the Fourth Proportional to 108,947.60, 163,421.40 and 86,640.20

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Solution

The fourth proportional to 108,947.60, 163,421.40 and 86,640.20 is: 129,960.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,947.60 : 163,421.40 = 86,640.20 : x
  2. Step 2: Convert to fraction form
    108,947.60/163,421.40 = 86,640.20/x
  3. Step 3: Cross multiply
    108,947.60x = 163,421.40 × 86,640.20
  4. Step 4: Simplify right side
    108,947.60x = 14,158,862,780.28
  5. Step 5: Solve for x
    x = 14,158,862,780.28/108,947.60
  6. Step 6: Final answer
    x = 129,960.30

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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.