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Finding the Fourth Proportional to 1,615.72, 2,423.57 and 520.17

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Solution

The fourth proportional to 1,615.72, 2,423.57 and 520.17 is: 780.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.72 : 2,423.57 = 520.17 : x
  2. Step 2: Convert to fraction form
    1,615.72/2,423.57 = 520.17/x
  3. Step 3: Cross multiply
    1,615.72x = 2,423.57 × 520.17
  4. Step 4: Simplify right side
    1,615.72x = 1,260,668.41
  5. Step 5: Solve for x
    x = 1,260,668.41/1,615.72
  6. Step 6: Final answer
    x = 780.25

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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.