Home / 12,387.98-17,090.24-8,402.78

Finding the Fourth Proportional to 12,387.98, 17,090.24 and 8,402.78

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Solution

The fourth proportional to 12,387.98, 17,090.24 and 8,402.78 is: 11,592.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,387.98 : 17,090.24 = 8,402.78 : x
  2. Step 2: Convert to fraction form
    12,387.98/17,090.24 = 8,402.78/x
  3. Step 3: Cross multiply
    12,387.98x = 17,090.24 × 8,402.78
  4. Step 4: Simplify right side
    12,387.98x = 143,605,526.87
  5. Step 5: Solve for x
    x = 143,605,526.87/12,387.98
  6. Step 6: Final answer
    x = 11,592.33

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1.5x scale

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.