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Finding the Fourth Proportional to 882.30, 1,218.78 and 688.36

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Solution

The fourth proportional to 882.30, 1,218.78 and 688.36 is: 950.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.30 : 1,218.78 = 688.36 : x
  2. Step 2: Convert to fraction form
    882.30/1,218.78 = 688.36/x
  3. Step 3: Cross multiply
    882.30x = 1,218.78 × 688.36
  4. Step 4: Simplify right side
    882.30x = 838,959.40
  5. Step 5: Solve for x
    x = 838,959.40/882.30
  6. Step 6: Final answer
    x = 950.88

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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.