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Finding the Fourth Proportional to 515.60, 696.60 and 515.60

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Solution

The fourth proportional to 515.60, 696.60 and 515.60 is: 696.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.60 : 696.60 = 515.60 : x
  2. Step 2: Convert to fraction form
    515.60/696.60 = 515.60/x
  3. Step 3: Cross multiply
    515.60x = 696.60 × 515.60
  4. Step 4: Simplify right side
    515.60x = 359,166.96
  5. Step 5: Solve for x
    x = 359,166.96/515.60
  6. Step 6: Final answer
    x = 696.60

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.