Home / 138,142.16-190,620.72-77,711.55

Finding the Fourth Proportional to 138,142.16, 190,620.72 and 77,711.55

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Solution

The fourth proportional to 138,142.16, 190,620.72 and 77,711.55 is: 107,233.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,142.16 : 190,620.72 = 77,711.55 : x
  2. Step 2: Convert to fraction form
    138,142.16/190,620.72 = 77,711.55/x
  3. Step 3: Cross multiply
    138,142.16x = 190,620.72 × 77,711.55
  4. Step 4: Simplify right side
    138,142.16x = 14,813,430,898.49
  5. Step 5: Solve for x
    x = 14,813,430,898.49/138,142.16
  6. Step 6: Final answer
    x = 107,233.24

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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.