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Finding the Fourth Proportional to 515, 710.74 and 293.90

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Solution

The fourth proportional to 515, 710.74 and 293.90 is: 405.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    515 : 710.74 = 293.90 : x
  2. Step 2: Convert to fraction form
    515/710.74 = 293.90/x
  3. Step 3: Cross multiply
    515x = 710.74 × 293.90
  4. Step 4: Simplify right side
    515x = 208,886.49
  5. Step 5: Solve for x
    x = 208,886.49/515
  6. Step 6: Final answer
    x = 405.60

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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.