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Finding the Fourth Proportional to 1,005.64, 1,387.71 and 674.01

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Solution

The fourth proportional to 1,005.64, 1,387.71 and 674.01 is: 930.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.64 : 1,387.71 = 674.01 : x
  2. Step 2: Convert to fraction form
    1,005.64/1,387.71 = 674.01/x
  3. Step 3: Cross multiply
    1,005.64x = 1,387.71 × 674.01
  4. Step 4: Simplify right side
    1,005.64x = 935,330.42
  5. Step 5: Solve for x
    x = 935,330.42/1,005.64
  6. Step 6: Final answer
    x = 930.09

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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.