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Finding the Fourth Proportional to 988.11, 1,473.45 and 921.09

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Solution

The fourth proportional to 988.11, 1,473.45 and 921.09 is: 1,373.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.11 : 1,473.45 = 921.09 : x
  2. Step 2: Convert to fraction form
    988.11/1,473.45 = 921.09/x
  3. Step 3: Cross multiply
    988.11x = 1,473.45 × 921.09
  4. Step 4: Simplify right side
    988.11x = 1,357,180.06
  5. Step 5: Solve for x
    x = 1,357,180.06/988.11
  6. Step 6: Final answer
    x = 1,373.51

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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.