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Finding the Fourth Proportional to 370.85, 511.95 and 287.76

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Solution

The fourth proportional to 370.85, 511.95 and 287.76 is: 397.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.85 : 511.95 = 287.76 : x
  2. Step 2: Convert to fraction form
    370.85/511.95 = 287.76/x
  3. Step 3: Cross multiply
    370.85x = 511.95 × 287.76
  4. Step 4: Simplify right side
    370.85x = 147,317.29
  5. Step 5: Solve for x
    x = 147,317.29/370.85
  6. Step 6: Final answer
    x = 397.25

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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.