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Finding the Fourth Proportional to 370.78, 511.70 and 215.53

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Solution

The fourth proportional to 370.78, 511.70 and 215.53 is: 297.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.78 : 511.70 = 215.53 : x
  2. Step 2: Convert to fraction form
    370.78/511.70 = 215.53/x
  3. Step 3: Cross multiply
    370.78x = 511.70 × 215.53
  4. Step 4: Simplify right side
    370.78x = 110,283.06
  5. Step 5: Solve for x
    x = 110,283.06/370.78
  6. Step 6: Final answer
    x = 297.44

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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.