Home / 78,765.36-118,073.40-31,409.76

Finding the Fourth Proportional to 78,765.36, 118,073.40 and 31,409.76

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Solution

The fourth proportional to 78,765.36, 118,073.40 and 31,409.76 is: 47,084.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,765.36 : 118,073.40 = 31,409.76 : x
  2. Step 2: Convert to fraction form
    78,765.36/118,073.40 = 31,409.76/x
  3. Step 3: Cross multiply
    78,765.36x = 118,073.40 × 31,409.76
  4. Step 4: Simplify right side
    78,765.36x = 3,708,657,156.38
  5. Step 5: Solve for x
    x = 3,708,657,156.38/78,765.36
  6. Step 6: Final answer
    x = 47,084.88

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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.