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Finding the Fourth Proportional to 984, 1,357.44 and 787.76

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Solution

The fourth proportional to 984, 1,357.44 and 787.76 is: 1,086.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    984 : 1,357.44 = 787.76 : x
  2. Step 2: Convert to fraction form
    984/1,357.44 = 787.76/x
  3. Step 3: Cross multiply
    984x = 1,357.44 × 787.76
  4. Step 4: Simplify right side
    984x = 1,069,336.93
  5. Step 5: Solve for x
    x = 1,069,336.93/984
  6. Step 6: Final answer
    x = 1,086.72

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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.