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Finding the Fourth Proportional to 988.49, 1,475.06 and 857.27

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Solution

The fourth proportional to 988.49, 1,475.06 and 857.27 is: 1,279.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.49 : 1,475.06 = 857.27 : x
  2. Step 2: Convert to fraction form
    988.49/1,475.06 = 857.27/x
  3. Step 3: Cross multiply
    988.49x = 1,475.06 × 857.27
  4. Step 4: Simplify right side
    988.49x = 1,264,524.69
  5. Step 5: Solve for x
    x = 1,264,524.69/988.49
  6. Step 6: Final answer
    x = 1,279.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.