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Finding the Fourth Proportional to 715,780.76, 987,796.35 and 389,115.74

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Solution

The fourth proportional to 715,780.76, 987,796.35 and 389,115.74 is: 536,990.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,780.76 : 987,796.35 = 389,115.74 : x
  2. Step 2: Convert to fraction form
    715,780.76/987,796.35 = 389,115.74/x
  3. Step 3: Cross multiply
    715,780.76x = 987,796.35 × 389,115.74
  4. Step 4: Simplify right side
    715,780.76x = 384,367,110,169.04
  5. Step 5: Solve for x
    x = 384,367,110,169.04/715,780.76
  6. Step 6: Final answer
    x = 536,990.00

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1.5x scale

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.