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Finding the Fourth Proportional to 1,787.72, 2,681.47 and 617.69

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Solution

The fourth proportional to 1,787.72, 2,681.47 and 617.69 is: 926.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,787.72 : 2,681.47 = 617.69 : x
  2. Step 2: Convert to fraction form
    1,787.72/2,681.47 = 617.69/x
  3. Step 3: Cross multiply
    1,787.72x = 2,681.47 × 617.69
  4. Step 4: Simplify right side
    1,787.72x = 1,656,314.12
  5. Step 5: Solve for x
    x = 1,656,314.12/1,787.72
  6. Step 6: Final answer
    x = 926.50

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1.5x scale

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.