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Finding the Fourth Proportional to 511.60, 717.20 and 511.60

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Solution

The fourth proportional to 511.60, 717.20 and 511.60 is: 717.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.60 : 717.20 = 511.60 : x
  2. Step 2: Convert to fraction form
    511.60/717.20 = 511.60/x
  3. Step 3: Cross multiply
    511.60x = 717.20 × 511.60
  4. Step 4: Simplify right side
    511.60x = 366,919.52
  5. Step 5: Solve for x
    x = 366,919.52/511.60
  6. Step 6: Final answer
    x = 717.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.