Home / 130,939.76-180,720.42-77,221.64

Finding the Fourth Proportional to 130,939.76, 180,720.42 and 77,221.64

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Solution

The fourth proportional to 130,939.76, 180,720.42 and 77,221.64 is: 106,579.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,939.76 : 180,720.42 = 77,221.64 : x
  2. Step 2: Convert to fraction form
    130,939.76/180,720.42 = 77,221.64/x
  3. Step 3: Cross multiply
    130,939.76x = 180,720.42 × 77,221.64
  4. Step 4: Simplify right side
    130,939.76x = 13,955,527,376.11
  5. Step 5: Solve for x
    x = 13,955,527,376.11/130,939.76
  6. Step 6: Final answer
    x = 106,579.75

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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.