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Finding the Fourth Proportional to 391,643.10, 587,464.65 and 125,412.30

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Solution

The fourth proportional to 391,643.10, 587,464.65 and 125,412.30 is: 188,118.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,643.10 : 587,464.65 = 125,412.30 : x
  2. Step 2: Convert to fraction form
    391,643.10/587,464.65 = 125,412.30/x
  3. Step 3: Cross multiply
    391,643.10x = 587,464.65 × 125,412.30
  4. Step 4: Simplify right side
    391,643.10x = 73,675,292,925.20
  5. Step 5: Solve for x
    x = 73,675,292,925.20/391,643.10
  6. Step 6: Final answer
    x = 188,118.45

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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.