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Finding the Fourth Proportional to 71,985.76, 99,340.88 and 40,156.72

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Solution

The fourth proportional to 71,985.76, 99,340.88 and 40,156.72 is: 55,416.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,985.76 : 99,340.88 = 40,156.72 : x
  2. Step 2: Convert to fraction form
    71,985.76/99,340.88 = 40,156.72/x
  3. Step 3: Cross multiply
    71,985.76x = 99,340.88 × 40,156.72
  4. Step 4: Simplify right side
    71,985.76x = 3,989,203,902.71
  5. Step 5: Solve for x
    x = 3,989,203,902.71/71,985.76
  6. Step 6: Final answer
    x = 55,416.57

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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.