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Finding the Fourth Proportional to 131,859.78, 181,967.36 and 71,430.42

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Solution

The fourth proportional to 131,859.78, 181,967.36 and 71,430.42 is: 98,574.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,859.78 : 181,967.36 = 71,430.42 : x
  2. Step 2: Convert to fraction form
    131,859.78/181,967.36 = 71,430.42/x
  3. Step 3: Cross multiply
    131,859.78x = 181,967.36 × 71,430.42
  4. Step 4: Simplify right side
    131,859.78x = 12,998,004,951.09
  5. Step 5: Solve for x
    x = 12,998,004,951.09/131,859.78
  6. Step 6: Final answer
    x = 98,574.45

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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.