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Finding the Fourth Proportional to 995.66, 1,377.10 and 787.90

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Solution

The fourth proportional to 995.66, 1,377.10 and 787.90 is: 1,089.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.66 : 1,377.10 = 787.90 : x
  2. Step 2: Convert to fraction form
    995.66/1,377.10 = 787.90/x
  3. Step 3: Cross multiply
    995.66x = 1,377.10 × 787.90
  4. Step 4: Simplify right side
    995.66x = 1,085,017.09
  5. Step 5: Solve for x
    x = 1,085,017.09/995.66
  6. Step 6: Final answer
    x = 1,089.75

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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.