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Finding the Fourth Proportional to 1,020.90, 1,529.96 and 745.71

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Solution

The fourth proportional to 1,020.90, 1,529.96 and 745.71 is: 1,117.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.90 : 1,529.96 = 745.71 : x
  2. Step 2: Convert to fraction form
    1,020.90/1,529.96 = 745.71/x
  3. Step 3: Cross multiply
    1,020.90x = 1,529.96 × 745.71
  4. Step 4: Simplify right side
    1,020.90x = 1,140,902.74
  5. Step 5: Solve for x
    x = 1,140,902.74/1,020.90
  6. Step 6: Final answer
    x = 1,117.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.