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Finding the Fourth Proportional to 760.52, 1,140.78 and 212.86

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Solution

The fourth proportional to 760.52, 1,140.78 and 212.86 is: 319.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.52 : 1,140.78 = 212.86 : x
  2. Step 2: Convert to fraction form
    760.52/1,140.78 = 212.86/x
  3. Step 3: Cross multiply
    760.52x = 1,140.78 × 212.86
  4. Step 4: Simplify right side
    760.52x = 242,826.43
  5. Step 5: Solve for x
    x = 242,826.43/760.52
  6. Step 6: Final answer
    x = 319.29

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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.