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Finding the Fourth Proportional to 1,357.68, 1,874.16 and 1,007.76

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Solution

The fourth proportional to 1,357.68, 1,874.16 and 1,007.76 is: 1,391.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.68 : 1,874.16 = 1,007.76 : x
  2. Step 2: Convert to fraction form
    1,357.68/1,874.16 = 1,007.76/x
  3. Step 3: Cross multiply
    1,357.68x = 1,874.16 × 1,007.76
  4. Step 4: Simplify right side
    1,357.68x = 1,888,703.48
  5. Step 5: Solve for x
    x = 1,888,703.48/1,357.68
  6. Step 6: Final answer
    x = 1,391.13

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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.