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Finding the Fourth Proportional to 150,643.45, 207,886.14 and 86,979.88

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Solution

The fourth proportional to 150,643.45, 207,886.14 and 86,979.88 is: 120,031.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    150,643.45 : 207,886.14 = 86,979.88 : x
  2. Step 2: Convert to fraction form
    150,643.45/207,886.14 = 86,979.88/x
  3. Step 3: Cross multiply
    150,643.45x = 207,886.14 × 86,979.88
  4. Step 4: Simplify right side
    150,643.45x = 18,081,911,510.86
  5. Step 5: Solve for x
    x = 18,081,911,510.86/150,643.45
  6. Step 6: Final answer
    x = 120,031.18

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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.