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Finding the Fourth Proportional to 659,320.40, 988,980.60 and 612,081.20

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Solution

The fourth proportional to 659,320.40, 988,980.60 and 612,081.20 is: 918,121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,320.40 : 988,980.60 = 612,081.20 : x
  2. Step 2: Convert to fraction form
    659,320.40/988,980.60 = 612,081.20/x
  3. Step 3: Cross multiply
    659,320.40x = 988,980.60 × 612,081.20
  4. Step 4: Simplify right side
    659,320.40x = 605,336,432,424.72
  5. Step 5: Solve for x
    x = 605,336,432,424.72/659,320.40
  6. Step 6: Final answer
    x = 918,121.80

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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.