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Finding the Fourth Proportional to 389,931.60, 584,605.80 and 212,638.80

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Solution

The fourth proportional to 389,931.60, 584,605.80 and 212,638.80 is: 318,799.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,931.60 : 584,605.80 = 212,638.80 : x
  2. Step 2: Convert to fraction form
    389,931.60/584,605.80 = 212,638.80/x
  3. Step 3: Cross multiply
    389,931.60x = 584,605.80 × 212,638.80
  4. Step 4: Simplify right side
    389,931.60x = 124,309,875,785.04
  5. Step 5: Solve for x
    x = 124,309,875,785.04/389,931.60
  6. Step 6: Final answer
    x = 318,799.18

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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.