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Finding the Fourth Proportional to 1,180.42, 1,629.04 and 787.18

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Solution

The fourth proportional to 1,180.42, 1,629.04 and 787.18 is: 1,086.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.42 : 1,629.04 = 787.18 : x
  2. Step 2: Convert to fraction form
    1,180.42/1,629.04 = 787.18/x
  3. Step 3: Cross multiply
    1,180.42x = 1,629.04 × 787.18
  4. Step 4: Simplify right side
    1,180.42x = 1,282,347.71
  5. Step 5: Solve for x
    x = 1,282,347.71/1,180.42
  6. Step 6: Final answer
    x = 1,086.35

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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.