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Finding the Fourth Proportional to 1,397.10, 1,928 and 873.13

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Solution

The fourth proportional to 1,397.10, 1,928 and 873.13 is: 1,204.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.10 : 1,928 = 873.13 : x
  2. Step 2: Convert to fraction form
    1,397.10/1,928 = 873.13/x
  3. Step 3: Cross multiply
    1,397.10x = 1,928 × 873.13
  4. Step 4: Simplify right side
    1,397.10x = 1,683,394.64
  5. Step 5: Solve for x
    x = 1,683,394.64/1,397.10
  6. Step 6: Final answer
    x = 1,204.92

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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.