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Finding the Fourth Proportional to 204,643.60, 307,007.07 and 86,315.38

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Solution

The fourth proportional to 204,643.60, 307,007.07 and 86,315.38 is: 129,490.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    204,643.60 : 307,007.07 = 86,315.38 : x
  2. Step 2: Convert to fraction form
    204,643.60/307,007.07 = 86,315.38/x
  3. Step 3: Cross multiply
    204,643.60x = 307,007.07 × 86,315.38
  4. Step 4: Simplify right side
    204,643.60x = 26,499,431,909.74
  5. Step 5: Solve for x
    x = 26,499,431,909.74/204,643.60
  6. Step 6: Final answer
    x = 129,490.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.