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Finding the Fourth Proportional to 108,640.80, 162,961.20 and 89,978.40

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Solution

The fourth proportional to 108,640.80, 162,961.20 and 89,978.40 is: 134,967.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,640.80 : 162,961.20 = 89,978.40 : x
  2. Step 2: Convert to fraction form
    108,640.80/162,961.20 = 89,978.40/x
  3. Step 3: Cross multiply
    108,640.80x = 162,961.20 × 89,978.40
  4. Step 4: Simplify right side
    108,640.80x = 14,662,988,038.08
  5. Step 5: Solve for x
    x = 14,662,988,038.08/108,640.80
  6. Step 6: Final answer
    x = 134,967.60

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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.