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Finding the Fourth Proportional to 1,013.38, 1,398.63 and 571.40

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Solution

The fourth proportional to 1,013.38, 1,398.63 and 571.40 is: 788.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.38 : 1,398.63 = 571.40 : x
  2. Step 2: Convert to fraction form
    1,013.38/1,398.63 = 571.40/x
  3. Step 3: Cross multiply
    1,013.38x = 1,398.63 × 571.40
  4. Step 4: Simplify right side
    1,013.38x = 799,177.18
  5. Step 5: Solve for x
    x = 799,177.18/1,013.38
  6. Step 6: Final answer
    x = 788.63

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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.