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Finding the Fourth Proportional to 898.47, 1,239.48 and 649.40

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Solution

The fourth proportional to 898.47, 1,239.48 and 649.40 is: 895.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.47 : 1,239.48 = 649.40 : x
  2. Step 2: Convert to fraction form
    898.47/1,239.48 = 649.40/x
  3. Step 3: Cross multiply
    898.47x = 1,239.48 × 649.40
  4. Step 4: Simplify right side
    898.47x = 804,908.87
  5. Step 5: Solve for x
    x = 804,908.87/898.47
  6. Step 6: Final answer
    x = 895.87

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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.