Home / 78,590.32-108,455.05-42,780.62

Finding the Fourth Proportional to 78,590.32, 108,455.05 and 42,780.62

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Solution

The fourth proportional to 78,590.32, 108,455.05 and 42,780.62 is: 59,037.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,590.32 : 108,455.05 = 42,780.62 : x
  2. Step 2: Convert to fraction form
    78,590.32/108,455.05 = 42,780.62/x
  3. Step 3: Cross multiply
    78,590.32x = 108,455.05 × 42,780.62
  4. Step 4: Simplify right side
    78,590.32x = 4,639,774,605.74
  5. Step 5: Solve for x
    x = 4,639,774,605.74/78,590.32
  6. Step 6: Final answer
    x = 59,037.48

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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.