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Finding the Fourth Proportional to 1,192.90, 1,787.28 and 645.46

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Solution

The fourth proportional to 1,192.90, 1,787.28 and 645.46 is: 967.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,192.90 : 1,787.28 = 645.46 : x
  2. Step 2: Convert to fraction form
    1,192.90/1,787.28 = 645.46/x
  3. Step 3: Cross multiply
    1,192.90x = 1,787.28 × 645.46
  4. Step 4: Simplify right side
    1,192.90x = 1,153,617.75
  5. Step 5: Solve for x
    x = 1,153,617.75/1,192.90
  6. Step 6: Final answer
    x = 967.07

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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.