Home / 78,424.89-108,315.09-51,686.12

Finding the Fourth Proportional to 78,424.89, 108,315.09 and 51,686.12

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Solution

The fourth proportional to 78,424.89, 108,315.09 and 51,686.12 is: 71,385.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,424.89 : 108,315.09 = 51,686.12 : x
  2. Step 2: Convert to fraction form
    78,424.89/108,315.09 = 51,686.12/x
  3. Step 3: Cross multiply
    78,424.89x = 108,315.09 × 51,686.12
  4. Step 4: Simplify right side
    78,424.89x = 5,598,386,197.98
  5. Step 5: Solve for x
    x = 5,598,386,197.98/78,424.89
  6. Step 6: Final answer
    x = 71,385.32

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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.