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Finding the Fourth Proportional to 347.17, 478.95 and 215.95

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Solution

The fourth proportional to 347.17, 478.95 and 215.95 is: 297.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.17 : 478.95 = 215.95 : x
  2. Step 2: Convert to fraction form
    347.17/478.95 = 215.95/x
  3. Step 3: Cross multiply
    347.17x = 478.95 × 215.95
  4. Step 4: Simplify right side
    347.17x = 103,429.25
  5. Step 5: Solve for x
    x = 103,429.25/347.17
  6. Step 6: Final answer
    x = 297.92

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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.