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Finding the Fourth Proportional to 130,989.72, 180,765.81 and 71,373.72

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Solution

The fourth proportional to 130,989.72, 180,765.81 and 71,373.72 is: 98,495.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,989.72 : 180,765.81 = 71,373.72 : x
  2. Step 2: Convert to fraction form
    130,989.72/180,765.81 = 71,373.72/x
  3. Step 3: Cross multiply
    130,989.72x = 180,765.81 × 71,373.72
  4. Step 4: Simplify right side
    130,989.72x = 12,901,927,404.68
  5. Step 5: Solve for x
    x = 12,901,927,404.68/130,989.72
  6. Step 6: Final answer
    x = 98,495.73

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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.