Home / 991,990.80-1,487,986.20-518,821.20

Finding the Fourth Proportional to 991,990.80, 1,487,986.20 and 518,821.20

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Solution

The fourth proportional to 991,990.80, 1,487,986.20 and 518,821.20 is: 778,231.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,990.80 : 1,487,986.20 = 518,821.20 : x
  2. Step 2: Convert to fraction form
    991,990.80/1,487,986.20 = 518,821.20/x
  3. Step 3: Cross multiply
    991,990.80x = 1,487,986.20 × 518,821.20
  4. Step 4: Simplify right side
    991,990.80x = 771,998,785,867.44
  5. Step 5: Solve for x
    x = 771,998,785,867.44/991,990.80
  6. Step 6: Final answer
    x = 778,231.80

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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.