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Finding the Fourth Proportional to 1,113.04, 1,671.72 and 920.71

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Solution

The fourth proportional to 1,113.04, 1,671.72 and 920.71 is: 1,382.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.04 : 1,671.72 = 920.71 : x
  2. Step 2: Convert to fraction form
    1,113.04/1,671.72 = 920.71/x
  3. Step 3: Cross multiply
    1,113.04x = 1,671.72 × 920.71
  4. Step 4: Simplify right side
    1,113.04x = 1,539,169.32
  5. Step 5: Solve for x
    x = 1,539,169.32/1,113.04
  6. Step 6: Final answer
    x = 1,382.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.