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Finding the Fourth Proportional to 659,722.20, 991,697.40 and 612,920.40

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Solution

The fourth proportional to 659,722.20, 991,697.40 and 612,920.40 is: 921,344.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,722.20 : 991,697.40 = 612,920.40 : x
  2. Step 2: Convert to fraction form
    659,722.20/991,697.40 = 612,920.40/x
  3. Step 3: Cross multiply
    659,722.20x = 991,697.40 × 612,920.40
  4. Step 4: Simplify right side
    659,722.20x = 607,831,567,086.96
  5. Step 5: Solve for x
    x = 607,831,567,086.96/659,722.20
  6. Step 6: Final answer
    x = 921,344.72

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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.