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Finding the Fourth Proportional to 131,424, 181,365.36 and 71,808

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Solution

The fourth proportional to 131,424, 181,365.36 and 71,808 is: 99,095.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,424 : 181,365.36 = 71,808 : x
  2. Step 2: Convert to fraction form
    131,424/181,365.36 = 71,808/x
  3. Step 3: Cross multiply
    131,424x = 181,365.36 × 71,808
  4. Step 4: Simplify right side
    131,424x = 13,023,483,770.88
  5. Step 5: Solve for x
    x = 13,023,483,770.88/131,424
  6. Step 6: Final answer
    x = 99,095.17

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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.