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Finding the Fourth Proportional to 1,615.64, 2,423.20 and 640.76

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Solution

The fourth proportional to 1,615.64, 2,423.20 and 640.76 is: 961.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.64 : 2,423.20 = 640.76 : x
  2. Step 2: Convert to fraction form
    1,615.64/2,423.20 = 640.76/x
  3. Step 3: Cross multiply
    1,615.64x = 2,423.20 × 640.76
  4. Step 4: Simplify right side
    1,615.64x = 1,552,689.63
  5. Step 5: Solve for x
    x = 1,552,689.63/1,615.64
  6. Step 6: Final answer
    x = 961.04

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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.