Home / 86,128.38-129,130.20-26,931.96

Finding the Fourth Proportional to 86,128.38, 129,130.20 and 26,931.96

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Solution

The fourth proportional to 86,128.38, 129,130.20 and 26,931.96 is: 40,378.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,128.38 : 129,130.20 = 26,931.96 : x
  2. Step 2: Convert to fraction form
    86,128.38/129,130.20 = 26,931.96/x
  3. Step 3: Cross multiply
    86,128.38x = 129,130.20 × 26,931.96
  4. Step 4: Simplify right side
    86,128.38x = 3,477,729,381.19
  5. Step 5: Solve for x
    x = 3,477,729,381.19/86,128.38
  6. Step 6: Final answer
    x = 40,378.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.