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Finding the Fourth Proportional to 659,311.40, 988,967.10 and 612,072.20

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Solution

The fourth proportional to 659,311.40, 988,967.10 and 612,072.20 is: 918,108.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,311.40 : 988,967.10 = 612,072.20 : x
  2. Step 2: Convert to fraction form
    659,311.40/988,967.10 = 612,072.20/x
  3. Step 3: Cross multiply
    659,311.40x = 988,967.10 × 612,072.20
  4. Step 4: Simplify right side
    659,311.40x = 605,319,268,624.62
  5. Step 5: Solve for x
    x = 605,319,268,624.62/659,311.40
  6. Step 6: Final answer
    x = 918,108.30

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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.