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Finding the Fourth Proportional to 1,439.46, 1,986.75 and 915.39

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Solution

The fourth proportional to 1,439.46, 1,986.75 and 915.39 is: 1,263.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.46 : 1,986.75 = 915.39 : x
  2. Step 2: Convert to fraction form
    1,439.46/1,986.75 = 915.39/x
  3. Step 3: Cross multiply
    1,439.46x = 1,986.75 × 915.39
  4. Step 4: Simplify right side
    1,439.46x = 1,818,651.08
  5. Step 5: Solve for x
    x = 1,818,651.08/1,439.46
  6. Step 6: Final answer
    x = 1,263.43

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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.