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Finding the Fourth Proportional to 72,399.60, 99,915.44 and 40,578.72

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Solution

The fourth proportional to 72,399.60, 99,915.44 and 40,578.72 is: 56,000.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,399.60 : 99,915.44 = 40,578.72 : x
  2. Step 2: Convert to fraction form
    72,399.60/99,915.44 = 40,578.72/x
  3. Step 3: Cross multiply
    72,399.60x = 99,915.44 × 40,578.72
  4. Step 4: Simplify right side
    72,399.60x = 4,054,440,663.44
  5. Step 5: Solve for x
    x = 4,054,440,663.44/72,399.60
  6. Step 6: Final answer
    x = 56,000.87

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1.5x scale

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.