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Finding the Fourth Proportional to 1,787.40, 2,681.18 and 923.40

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Solution

The fourth proportional to 1,787.40, 2,681.18 and 923.40 is: 1,385.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.40 : 2,681.18 = 923.40 : x
  2. Step 2: Convert to fraction form
    1,787.40/2,681.18 = 923.40/x
  3. Step 3: Cross multiply
    1,787.40x = 2,681.18 × 923.40
  4. Step 4: Simplify right side
    1,787.40x = 2,475,801.61
  5. Step 5: Solve for x
    x = 2,475,801.61/1,787.40
  6. Step 6: Final answer
    x = 1,385.14

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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.