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Finding the Fourth Proportional to 1,415.44, 1,951.88 and 891.28

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Solution

The fourth proportional to 1,415.44, 1,951.88 and 891.28 is: 1,229.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.44 : 1,951.88 = 891.28 : x
  2. Step 2: Convert to fraction form
    1,415.44/1,951.88 = 891.28/x
  3. Step 3: Cross multiply
    1,415.44x = 1,951.88 × 891.28
  4. Step 4: Simplify right side
    1,415.44x = 1,739,671.61
  5. Step 5: Solve for x
    x = 1,739,671.61/1,415.44
  6. Step 6: Final answer
    x = 1,229.07

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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.