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Finding the Fourth Proportional to 1,013.67, 1,398.76 and 571.51

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Solution

The fourth proportional to 1,013.67, 1,398.76 and 571.51 is: 788.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.67 : 1,398.76 = 571.51 : x
  2. Step 2: Convert to fraction form
    1,013.67/1,398.76 = 571.51/x
  3. Step 3: Cross multiply
    1,013.67x = 1,398.76 × 571.51
  4. Step 4: Simplify right side
    1,013.67x = 799,405.33
  5. Step 5: Solve for x
    x = 799,405.33/1,013.67
  6. Step 6: Final answer
    x = 788.62

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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.