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Finding the Fourth Proportional to 156,356.97, 215,795.78 and 99,001.63

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Solution

The fourth proportional to 156,356.97, 215,795.78 and 99,001.63 is: 136,636.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,356.97 : 215,795.78 = 99,001.63 : x
  2. Step 2: Convert to fraction form
    156,356.97/215,795.78 = 99,001.63/x
  3. Step 3: Cross multiply
    156,356.97x = 215,795.78 × 99,001.63
  4. Step 4: Simplify right side
    156,356.97x = 21,364,132,888.14
  5. Step 5: Solve for x
    x = 21,364,132,888.14/156,356.97
  6. Step 6: Final answer
    x = 136,636.91

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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.