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Finding the Fourth Proportional to 1,787.32, 2,466.42 and 990.59

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Solution

The fourth proportional to 1,787.32, 2,466.42 and 990.59 is: 1,366.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.32 : 2,466.42 = 990.59 : x
  2. Step 2: Convert to fraction form
    1,787.32/2,466.42 = 990.59/x
  3. Step 3: Cross multiply
    1,787.32x = 2,466.42 × 990.59
  4. Step 4: Simplify right side
    1,787.32x = 2,443,210.99
  5. Step 5: Solve for x
    x = 2,443,210.99/1,787.32
  6. Step 6: Final answer
    x = 1,366.97

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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.