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Finding the Fourth Proportional to 515.12, 710.79 and 340.70

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Solution

The fourth proportional to 515.12, 710.79 and 340.70 is: 470.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.12 : 710.79 = 340.70 : x
  2. Step 2: Convert to fraction form
    515.12/710.79 = 340.70/x
  3. Step 3: Cross multiply
    515.12x = 710.79 × 340.70
  4. Step 4: Simplify right side
    515.12x = 242,166.15
  5. Step 5: Solve for x
    x = 242,166.15/515.12
  6. Step 6: Final answer
    x = 470.12

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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.