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Finding the Fourth Proportional to 760.74, 1,140.92 and 212.78

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Solution

The fourth proportional to 760.74, 1,140.92 and 212.78 is: 319.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.74 : 1,140.92 = 212.78 : x
  2. Step 2: Convert to fraction form
    760.74/1,140.92 = 212.78/x
  3. Step 3: Cross multiply
    760.74x = 1,140.92 × 212.78
  4. Step 4: Simplify right side
    760.74x = 242,764.96
  5. Step 5: Solve for x
    x = 242,764.96/760.74
  6. Step 6: Final answer
    x = 319.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.