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Finding the Fourth Proportional to 760.36, 1,140.37 and 212.61

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Solution

The fourth proportional to 760.36, 1,140.37 and 212.61 is: 318.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.36 : 1,140.37 = 212.61 : x
  2. Step 2: Convert to fraction form
    760.36/1,140.37 = 212.61/x
  3. Step 3: Cross multiply
    760.36x = 1,140.37 × 212.61
  4. Step 4: Simplify right side
    760.36x = 242,454.07
  5. Step 5: Solve for x
    x = 242,454.07/760.36
  6. Step 6: Final answer
    x = 318.87

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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.