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Finding the Fourth Proportional to 660,625.80, 990,938.70 and 394,905.30

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Solution

The fourth proportional to 660,625.80, 990,938.70 and 394,905.30 is: 592,357.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,625.80 : 990,938.70 = 394,905.30 : x
  2. Step 2: Convert to fraction form
    660,625.80/990,938.70 = 394,905.30/x
  3. Step 3: Cross multiply
    660,625.80x = 990,938.70 × 394,905.30
  4. Step 4: Simplify right side
    660,625.80x = 391,326,944,605.11
  5. Step 5: Solve for x
    x = 391,326,944,605.11/660,625.80
  6. Step 6: Final answer
    x = 592,357.95

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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.