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Finding the Fourth Proportional to 949.40, 1,421.28 and 515.24

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Solution

The fourth proportional to 949.40, 1,421.28 and 515.24 is: 771.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.40 : 1,421.28 = 515.24 : x
  2. Step 2: Convert to fraction form
    949.40/1,421.28 = 515.24/x
  3. Step 3: Cross multiply
    949.40x = 1,421.28 × 515.24
  4. Step 4: Simplify right side
    949.40x = 732,300.31
  5. Step 5: Solve for x
    x = 732,300.31/949.40
  6. Step 6: Final answer
    x = 771.33

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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.