Home / 78,587.70-108,453.47-42,780.10

Finding the Fourth Proportional to 78,587.70, 108,453.47 and 42,780.10

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Solution

The fourth proportional to 78,587.70, 108,453.47 and 42,780.10 is: 59,037.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,587.70 : 108,453.47 = 42,780.10 : x
  2. Step 2: Convert to fraction form
    78,587.70/108,453.47 = 42,780.10/x
  3. Step 3: Cross multiply
    78,587.70x = 108,453.47 × 42,780.10
  4. Step 4: Simplify right side
    78,587.70x = 4,639,649,749.68
  5. Step 5: Solve for x
    x = 4,639,649,749.68/78,587.70
  6. Step 6: Final answer
    x = 59,037.86

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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.