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Finding the Fourth Proportional to 1,165.45, 1,607.82 and 987.65

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Solution

The fourth proportional to 1,165.45, 1,607.82 and 987.65 is: 1,362.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.45 : 1,607.82 = 987.65 : x
  2. Step 2: Convert to fraction form
    1,165.45/1,607.82 = 987.65/x
  3. Step 3: Cross multiply
    1,165.45x = 1,607.82 × 987.65
  4. Step 4: Simplify right side
    1,165.45x = 1,587,963.42
  5. Step 5: Solve for x
    x = 1,587,963.42/1,165.45
  6. Step 6: Final answer
    x = 1,362.53

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1.5x scale

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.