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Finding the Fourth Proportional to 1,767.19, 2,648.69 and 987.16

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Solution

The fourth proportional to 1,767.19, 2,648.69 and 987.16 is: 1,479.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,767.19 : 2,648.69 = 987.16 : x
  2. Step 2: Convert to fraction form
    1,767.19/2,648.69 = 987.16/x
  3. Step 3: Cross multiply
    1,767.19x = 2,648.69 × 987.16
  4. Step 4: Simplify right side
    1,767.19x = 2,614,662.64
  5. Step 5: Solve for x
    x = 2,614,662.64/1,767.19
  6. Step 6: Final answer
    x = 1,479.56

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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.