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Finding the Fourth Proportional to 1,391.68, 1,920.66 and 867.76

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Solution

The fourth proportional to 1,391.68, 1,920.66 and 867.76 is: 1,197.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.68 : 1,920.66 = 867.76 : x
  2. Step 2: Convert to fraction form
    1,391.68/1,920.66 = 867.76/x
  3. Step 3: Cross multiply
    1,391.68x = 1,920.66 × 867.76
  4. Step 4: Simplify right side
    1,391.68x = 1,666,671.92
  5. Step 5: Solve for x
    x = 1,666,671.92/1,391.68
  6. Step 6: Final answer
    x = 1,197.60

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1.5x scale

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.