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Finding the Fourth Proportional to 114,643.20, 171,964.80 and 86,649.60

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Solution

The fourth proportional to 114,643.20, 171,964.80 and 86,649.60 is: 129,974.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    114,643.20 : 171,964.80 = 86,649.60 : x
  2. Step 2: Convert to fraction form
    114,643.20/171,964.80 = 86,649.60/x
  3. Step 3: Cross multiply
    114,643.20x = 171,964.80 × 86,649.60
  4. Step 4: Simplify right side
    114,643.20x = 14,900,681,134.08
  5. Step 5: Solve for x
    x = 14,900,681,134.08/114,643.20
  6. Step 6: Final answer
    x = 129,974.40

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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.