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Finding the Fourth Proportional to 1,013.90, 1,399.05 and 571.77

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Solution

The fourth proportional to 1,013.90, 1,399.05 and 571.77 is: 788.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.90 : 1,399.05 = 571.77 : x
  2. Step 2: Convert to fraction form
    1,013.90/1,399.05 = 571.77/x
  3. Step 3: Cross multiply
    1,013.90x = 1,399.05 × 571.77
  4. Step 4: Simplify right side
    1,013.90x = 799,934.82
  5. Step 5: Solve for x
    x = 799,934.82/1,013.90
  6. Step 6: Final answer
    x = 788.97

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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.