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Finding the Fourth Proportional to 78,487.20, 117,730.80 and 48,938.40

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Solution

The fourth proportional to 78,487.20, 117,730.80 and 48,938.40 is: 73,407.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,487.20 : 117,730.80 = 48,938.40 : x
  2. Step 2: Convert to fraction form
    78,487.20/117,730.80 = 48,938.40/x
  3. Step 3: Cross multiply
    78,487.20x = 117,730.80 × 48,938.40
  4. Step 4: Simplify right side
    78,487.20x = 5,761,556,982.72
  5. Step 5: Solve for x
    x = 5,761,556,982.72/78,487.20
  6. Step 6: Final answer
    x = 73,407.60

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1.5x scale

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.