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Finding the Fourth Proportional to 722,013.96, 996,375.67 and 390,868.95

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Solution

The fourth proportional to 722,013.96, 996,375.67 and 390,868.95 is: 539,397.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,013.96 : 996,375.67 = 390,868.95 : x
  2. Step 2: Convert to fraction form
    722,013.96/996,375.67 = 390,868.95/x
  3. Step 3: Cross multiply
    722,013.96x = 996,375.67 × 390,868.95
  4. Step 4: Simplify right side
    722,013.96x = 389,452,311,938.45
  5. Step 5: Solve for x
    x = 389,452,311,938.45/722,013.96
  6. Step 6: Final answer
    x = 539,397.20

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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.