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Finding the Fourth Proportional to 131,391, 181,320.30 and 71,775

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Solution

The fourth proportional to 131,391, 181,320.30 and 71,775 is: 99,049.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,391 : 181,320.30 = 71,775 : x
  2. Step 2: Convert to fraction form
    131,391/181,320.30 = 71,775/x
  3. Step 3: Cross multiply
    131,391x = 181,320.30 × 71,775
  4. Step 4: Simplify right side
    131,391x = 13,014,264,532.50
  5. Step 5: Solve for x
    x = 13,014,264,532.50/131,391
  6. Step 6: Final answer
    x = 99,049.89

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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.