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Finding the Fourth Proportional to 1,672.20, 2,507.40 and 517.68

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Solution

The fourth proportional to 1,672.20, 2,507.40 and 517.68 is: 776.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,672.20 : 2,507.40 = 517.68 : x
  2. Step 2: Convert to fraction form
    1,672.20/2,507.40 = 517.68/x
  3. Step 3: Cross multiply
    1,672.20x = 2,507.40 × 517.68
  4. Step 4: Simplify right side
    1,672.20x = 1,298,030.83
  5. Step 5: Solve for x
    x = 1,298,030.83/1,672.20
  6. Step 6: Final answer
    x = 776.24

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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.