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Finding the Fourth Proportional to 898.48, 1,239.48 and 768.88

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Solution

The fourth proportional to 898.48, 1,239.48 and 768.88 is: 1,060.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.48 : 1,239.48 = 768.88 : x
  2. Step 2: Convert to fraction form
    898.48/1,239.48 = 768.88/x
  3. Step 3: Cross multiply
    898.48x = 1,239.48 × 768.88
  4. Step 4: Simplify right side
    898.48x = 953,011.38
  5. Step 5: Solve for x
    x = 953,011.38/898.48
  6. Step 6: Final answer
    x = 1,060.69

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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.