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Finding the Fourth Proportional to 1,020.86, 1,531.19 and 404.40

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Solution

The fourth proportional to 1,020.86, 1,531.19 and 404.40 is: 606.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.86 : 1,531.19 = 404.40 : x
  2. Step 2: Convert to fraction form
    1,020.86/1,531.19 = 404.40/x
  3. Step 3: Cross multiply
    1,020.86x = 1,531.19 × 404.40
  4. Step 4: Simplify right side
    1,020.86x = 619,214.25
  5. Step 5: Solve for x
    x = 619,214.25/1,020.86
  6. Step 6: Final answer
    x = 606.56

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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.