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Finding the Fourth Proportional to 1,013.40, 1,398.24 and 640.38

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Solution

The fourth proportional to 1,013.40, 1,398.24 and 640.38 is: 883.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.40 : 1,398.24 = 640.38 : x
  2. Step 2: Convert to fraction form
    1,013.40/1,398.24 = 640.38/x
  3. Step 3: Cross multiply
    1,013.40x = 1,398.24 × 640.38
  4. Step 4: Simplify right side
    1,013.40x = 895,404.93
  5. Step 5: Solve for x
    x = 895,404.93/1,013.40
  6. Step 6: Final answer
    x = 883.57

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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.