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Finding the Fourth Proportional to 515, 710.70 and 308

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Solution

The fourth proportional to 515, 710.70 and 308 is: 425.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    515 : 710.70 = 308 : x
  2. Step 2: Convert to fraction form
    515/710.70 = 308/x
  3. Step 3: Cross multiply
    515x = 710.70 × 308
  4. Step 4: Simplify right side
    515x = 218,895.60
  5. Step 5: Solve for x
    x = 218,895.60/515
  6. Step 6: Final answer
    x = 425.04

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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.