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Finding the Fourth Proportional to 391,503.60, 587,255.40 and 258,643.35

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Solution

The fourth proportional to 391,503.60, 587,255.40 and 258,643.35 is: 387,965.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,503.60 : 587,255.40 = 258,643.35 : x
  2. Step 2: Convert to fraction form
    391,503.60/587,255.40 = 258,643.35/x
  3. Step 3: Cross multiply
    391,503.60x = 587,255.40 × 258,643.35
  4. Step 4: Simplify right side
    391,503.60x = 151,889,703,961.59
  5. Step 5: Solve for x
    x = 151,889,703,961.59/391,503.60
  6. Step 6: Final answer
    x = 387,965.03

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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.