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Finding the Fourth Proportional to 71,238.72, 98,203.68 and 61,118.40

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Solution

The fourth proportional to 71,238.72, 98,203.68 and 61,118.40 is: 84,252.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,238.72 : 98,203.68 = 61,118.40 : x
  2. Step 2: Convert to fraction form
    71,238.72/98,203.68 = 61,118.40/x
  3. Step 3: Cross multiply
    71,238.72x = 98,203.68 × 61,118.40
  4. Step 4: Simplify right side
    71,238.72x = 6,002,051,795.71
  5. Step 5: Solve for x
    x = 6,002,051,795.71/71,238.72
  6. Step 6: Final answer
    x = 84,252.66

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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.