Home / 579,620.40-868,264.20-390,663.60

Finding the Fourth Proportional to 579,620.40, 868,264.20 and 390,663.60

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Solution

The fourth proportional to 579,620.40, 868,264.20 and 390,663.60 is: 585,209.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,620.40 : 868,264.20 = 390,663.60 : x
  2. Step 2: Convert to fraction form
    579,620.40/868,264.20 = 390,663.60/x
  3. Step 3: Cross multiply
    579,620.40x = 868,264.20 × 390,663.60
  4. Step 4: Simplify right side
    579,620.40x = 339,199,218,123.12
  5. Step 5: Solve for x
    x = 339,199,218,123.12/579,620.40
  6. Step 6: Final answer
    x = 585,209.25

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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.