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Finding the Fourth Proportional to 1,382.13, 1,904.72 and 988.47

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Solution

The fourth proportional to 1,382.13, 1,904.72 and 988.47 is: 1,362.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,382.13 : 1,904.72 = 988.47 : x
  2. Step 2: Convert to fraction form
    1,382.13/1,904.72 = 988.47/x
  3. Step 3: Cross multiply
    1,382.13x = 1,904.72 × 988.47
  4. Step 4: Simplify right side
    1,382.13x = 1,882,753.64
  5. Step 5: Solve for x
    x = 1,882,753.64/1,382.13
  6. Step 6: Final answer
    x = 1,362.21

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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.