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Finding the Fourth Proportional to 1,377.87, 2,067.35 and 915.63

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Solution

The fourth proportional to 1,377.87, 2,067.35 and 915.63 is: 1,373.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.87 : 2,067.35 = 915.63 : x
  2. Step 2: Convert to fraction form
    1,377.87/2,067.35 = 915.63/x
  3. Step 3: Cross multiply
    1,377.87x = 2,067.35 × 915.63
  4. Step 4: Simplify right side
    1,377.87x = 1,892,923.10
  5. Step 5: Solve for x
    x = 1,892,923.10/1,377.87
  6. Step 6: Final answer
    x = 1,373.80

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1.5x scale

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.