Home / 991,999.80-1,487,999.70-518,830.20

Finding the Fourth Proportional to 991,999.80, 1,487,999.70 and 518,830.20

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Solution

The fourth proportional to 991,999.80, 1,487,999.70 and 518,830.20 is: 778,245.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,999.80 : 1,487,999.70 = 518,830.20 : x
  2. Step 2: Convert to fraction form
    991,999.80/1,487,999.70 = 518,830.20/x
  3. Step 3: Cross multiply
    991,999.80x = 1,487,999.70 × 518,830.20
  4. Step 4: Simplify right side
    991,999.80x = 772,019,181,950.94
  5. Step 5: Solve for x
    x = 772,019,181,950.94/991,999.80
  6. Step 6: Final answer
    x = 778,245.30

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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.