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Finding the Fourth Proportional to 1,228.56, 1,695.60 and 787.50

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Solution

The fourth proportional to 1,228.56, 1,695.60 and 787.50 is: 1,086.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.56 : 1,695.60 = 787.50 : x
  2. Step 2: Convert to fraction form
    1,228.56/1,695.60 = 787.50/x
  3. Step 3: Cross multiply
    1,228.56x = 1,695.60 × 787.50
  4. Step 4: Simplify right side
    1,228.56x = 1,335,285
  5. Step 5: Solve for x
    x = 1,335,285/1,228.56
  6. Step 6: Final answer
    x = 1,086.87

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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.