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Finding the Fourth Proportional to 458,663.40, 687,995.10 and 279,037.80

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Solution

The fourth proportional to 458,663.40, 687,995.10 and 279,037.80 is: 418,556.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,663.40 : 687,995.10 = 279,037.80 : x
  2. Step 2: Convert to fraction form
    458,663.40/687,995.10 = 279,037.80/x
  3. Step 3: Cross multiply
    458,663.40x = 687,995.10 × 279,037.80
  4. Step 4: Simplify right side
    458,663.40x = 191,976,639,114.78
  5. Step 5: Solve for x
    x = 191,976,639,114.78/458,663.40
  6. Step 6: Final answer
    x = 418,556.70

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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.