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Finding the Fourth Proportional to 71,703.71, 98,978.18 and 61,591.67

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Solution

The fourth proportional to 71,703.71, 98,978.18 and 61,591.67 is: 85,019.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,703.71 : 98,978.18 = 61,591.67 : x
  2. Step 2: Convert to fraction form
    71,703.71/98,978.18 = 61,591.67/x
  3. Step 3: Cross multiply
    71,703.71x = 98,978.18 × 61,591.67
  4. Step 4: Simplify right side
    71,703.71x = 6,096,230,596.91
  5. Step 5: Solve for x
    x = 6,096,230,596.91/71,703.71
  6. Step 6: Final answer
    x = 85,019.74

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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.