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Finding the Fourth Proportional to 991,709.80, 1,489,119.90 and 571,805.80

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Solution

The fourth proportional to 991,709.80, 1,489,119.90 and 571,805.80 is: 858,605.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    991,709.80 : 1,489,119.90 = 571,805.80 : x
  2. Step 2: Convert to fraction form
    991,709.80/1,489,119.90 = 571,805.80/x
  3. Step 3: Cross multiply
    991,709.80x = 1,489,119.90 × 571,805.80
  4. Step 4: Simplify right side
    991,709.80x = 851,487,395,715.42
  5. Step 5: Solve for x
    x = 851,487,395,715.42/991,709.80
  6. Step 6: Final answer
    x = 858,605.41

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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.