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Finding the Fourth Proportional to 60,420.40, 90,630.60 and 39,425.20

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Solution

The fourth proportional to 60,420.40, 90,630.60 and 39,425.20 is: 59,137.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,420.40 : 90,630.60 = 39,425.20 : x
  2. Step 2: Convert to fraction form
    60,420.40/90,630.60 = 39,425.20/x
  3. Step 3: Cross multiply
    60,420.40x = 90,630.60 × 39,425.20
  4. Step 4: Simplify right side
    60,420.40x = 3,573,129,531.12
  5. Step 5: Solve for x
    x = 3,573,129,531.12/60,420.40
  6. Step 6: Final answer
    x = 59,137.80

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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.