Home / 90,710.12-125,136.42-78,113

Finding the Fourth Proportional to 90,710.12, 125,136.42 and 78,113

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Solution

The fourth proportional to 90,710.12, 125,136.42 and 78,113 is: 107,758.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,710.12 : 125,136.42 = 78,113 : x
  2. Step 2: Convert to fraction form
    90,710.12/125,136.42 = 78,113/x
  3. Step 3: Cross multiply
    90,710.12x = 125,136.42 × 78,113
  4. Step 4: Simplify right side
    90,710.12x = 9,774,781,175.46
  5. Step 5: Solve for x
    x = 9,774,781,175.46/90,710.12
  6. Step 6: Final answer
    x = 107,758.44

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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.