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Finding the Fourth Proportional to 1,787.80, 2,681.76 and 555.20

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Solution

The fourth proportional to 1,787.80, 2,681.76 and 555.20 is: 832.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.80 : 2,681.76 = 555.20 : x
  2. Step 2: Convert to fraction form
    1,787.80/2,681.76 = 555.20/x
  3. Step 3: Cross multiply
    1,787.80x = 2,681.76 × 555.20
  4. Step 4: Simplify right side
    1,787.80x = 1,488,913.15
  5. Step 5: Solve for x
    x = 1,488,913.15/1,787.80
  6. Step 6: Final answer
    x = 832.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.