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Finding the Fourth Proportional to 1,008.84, 1,390.32 and 787.44

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Solution

The fourth proportional to 1,008.84, 1,390.32 and 787.44 is: 1,085.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.84 : 1,390.32 = 787.44 : x
  2. Step 2: Convert to fraction form
    1,008.84/1,390.32 = 787.44/x
  3. Step 3: Cross multiply
    1,008.84x = 1,390.32 × 787.44
  4. Step 4: Simplify right side
    1,008.84x = 1,094,793.58
  5. Step 5: Solve for x
    x = 1,094,793.58/1,008.84
  6. Step 6: Final answer
    x = 1,085.20

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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.