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Finding the Fourth Proportional to 1,260.32, 1,738.91 and 787.47

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Solution

The fourth proportional to 1,260.32, 1,738.91 and 787.47 is: 1,086.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.32 : 1,738.91 = 787.47 : x
  2. Step 2: Convert to fraction form
    1,260.32/1,738.91 = 787.47/x
  3. Step 3: Cross multiply
    1,260.32x = 1,738.91 × 787.47
  4. Step 4: Simplify right side
    1,260.32x = 1,369,335.52
  5. Step 5: Solve for x
    x = 1,369,335.52/1,260.32
  6. Step 6: Final answer
    x = 1,086.50

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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.