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Finding the Fourth Proportional to 389,809.20, 584,713.80 and 318,950.40

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Solution

The fourth proportional to 389,809.20, 584,713.80 and 318,950.40 is: 478,425.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,809.20 : 584,713.80 = 318,950.40 : x
  2. Step 2: Convert to fraction form
    389,809.20/584,713.80 = 318,950.40/x
  3. Step 3: Cross multiply
    389,809.20x = 584,713.80 × 318,950.40
  4. Step 4: Simplify right side
    389,809.20x = 186,494,700,395.52
  5. Step 5: Solve for x
    x = 186,494,700,395.52/389,809.20
  6. Step 6: Final answer
    x = 478,425.60

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Similar ratio
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1.5x scale

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.