Home / 78,354.12-108,128-42,543.40

Finding the Fourth Proportional to 78,354.12, 108,128 and 42,543.40

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Solution

The fourth proportional to 78,354.12, 108,128 and 42,543.40 is: 58,709.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,354.12 : 108,128 = 42,543.40 : x
  2. Step 2: Convert to fraction form
    78,354.12/108,128 = 42,543.40/x
  3. Step 3: Cross multiply
    78,354.12x = 108,128 × 42,543.40
  4. Step 4: Simplify right side
    78,354.12x = 4,600,132,755.20
  5. Step 5: Solve for x
    x = 4,600,132,755.20/78,354.12
  6. Step 6: Final answer
    x = 58,709.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.