Home / 100,632.18-138,875.76-55,311.78

Finding the Fourth Proportional to 100,632.18, 138,875.76 and 55,311.78

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Solution

The fourth proportional to 100,632.18, 138,875.76 and 55,311.78 is: 76,332.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,632.18 : 138,875.76 = 55,311.78 : x
  2. Step 2: Convert to fraction form
    100,632.18/138,875.76 = 55,311.78/x
  3. Step 3: Cross multiply
    100,632.18x = 138,875.76 × 55,311.78
  4. Step 4: Simplify right side
    100,632.18x = 7,681,465,484.45
  5. Step 5: Solve for x
    x = 7,681,465,484.45/100,632.18
  6. Step 6: Final answer
    x = 76,332.10

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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.