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Finding the Fourth Proportional to 871,140.80, 1,202,090.64 and 489,080

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Solution

The fourth proportional to 871,140.80, 1,202,090.64 and 489,080 is: 674,883.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    871,140.80 : 1,202,090.64 = 489,080 : x
  2. Step 2: Convert to fraction form
    871,140.80/1,202,090.64 = 489,080/x
  3. Step 3: Cross multiply
    871,140.80x = 1,202,090.64 × 489,080
  4. Step 4: Simplify right side
    871,140.80x = 587,918,490,211.20
  5. Step 5: Solve for x
    x = 587,918,490,211.20/871,140.80
  6. Step 6: Final answer
    x = 674,883.43

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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.