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Finding the Fourth Proportional to 498,782.28, 688,299.66 and 280,985.88

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Solution

The fourth proportional to 498,782.28, 688,299.66 and 280,985.88 is: 387,749.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    498,782.28 : 688,299.66 = 280,985.88 : x
  2. Step 2: Convert to fraction form
    498,782.28/688,299.66 = 280,985.88/x
  3. Step 3: Cross multiply
    498,782.28x = 688,299.66 × 280,985.88
  4. Step 4: Simplify right side
    498,782.28x = 193,402,485,668.80
  5. Step 5: Solve for x
    x = 193,402,485,668.80/498,782.28
  6. Step 6: Final answer
    x = 387,749.31

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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.