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Finding the Fourth Proportional to 990,870, 1,367,354.84 and 561,153.20

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Solution

The fourth proportional to 990,870, 1,367,354.84 and 561,153.20 is: 774,365.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    990,870 : 1,367,354.84 = 561,153.20 : x
  2. Step 2: Convert to fraction form
    990,870/1,367,354.84 = 561,153.20/x
  3. Step 3: Cross multiply
    990,870x = 1,367,354.84 × 561,153.20
  4. Step 4: Simplify right side
    990,870x = 767,295,544,001.49
  5. Step 5: Solve for x
    x = 767,295,544,001.49/990,870
  6. Step 6: Final answer
    x = 774,365.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.