Home / 78,390.49-108,179.68-42,581.20

Finding the Fourth Proportional to 78,390.49, 108,179.68 and 42,581.20

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Solution

The fourth proportional to 78,390.49, 108,179.68 and 42,581.20 is: 58,762.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.49 : 108,179.68 = 42,581.20 : x
  2. Step 2: Convert to fraction form
    78,390.49/108,179.68 = 42,581.20/x
  3. Step 3: Cross multiply
    78,390.49x = 108,179.68 × 42,581.20
  4. Step 4: Simplify right side
    78,390.49x = 4,606,420,377.11
  5. Step 5: Solve for x
    x = 4,606,420,377.11/78,390.49
  6. Step 6: Final answer
    x = 58,762.49

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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.