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Finding the Fourth Proportional to 662.59, 914.21 and 515.64

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Solution

The fourth proportional to 662.59, 914.21 and 515.64 is: 711.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.59 : 914.21 = 515.64 : x
  2. Step 2: Convert to fraction form
    662.59/914.21 = 515.64/x
  3. Step 3: Cross multiply
    662.59x = 914.21 × 515.64
  4. Step 4: Simplify right side
    662.59x = 471,400.67
  5. Step 5: Solve for x
    x = 471,400.67/662.59
  6. Step 6: Final answer
    x = 711.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.