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Finding the Fourth Proportional to 1,397.29, 1,927.64 and 948.61

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Solution

The fourth proportional to 1,397.29, 1,927.64 and 948.61 is: 1,308.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.29 : 1,927.64 = 948.61 : x
  2. Step 2: Convert to fraction form
    1,397.29/1,927.64 = 948.61/x
  3. Step 3: Cross multiply
    1,397.29x = 1,927.64 × 948.61
  4. Step 4: Simplify right side
    1,397.29x = 1,828,576.69
  5. Step 5: Solve for x
    x = 1,828,576.69/1,397.29
  6. Step 6: Final answer
    x = 1,308.66

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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.