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Finding the Fourth Proportional to 155,867.02, 215,108.66 and 86,978.14

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Solution

The fourth proportional to 155,867.02, 215,108.66 and 86,978.14 is: 120,036.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,867.02 : 215,108.66 = 86,978.14 : x
  2. Step 2: Convert to fraction form
    155,867.02/215,108.66 = 86,978.14/x
  3. Step 3: Cross multiply
    155,867.02x = 215,108.66 × 86,978.14
  4. Step 4: Simplify right side
    155,867.02x = 18,709,750,498.20
  5. Step 5: Solve for x
    x = 18,709,750,498.20/155,867.02
  6. Step 6: Final answer
    x = 120,036.62

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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.