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Finding the Fourth Proportional to 760.26, 1,140.15 and 212.30

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Solution

The fourth proportional to 760.26, 1,140.15 and 212.30 is: 318.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.26 : 1,140.15 = 212.30 : x
  2. Step 2: Convert to fraction form
    760.26/1,140.15 = 212.30/x
  3. Step 3: Cross multiply
    760.26x = 1,140.15 × 212.30
  4. Step 4: Simplify right side
    760.26x = 242,053.85
  5. Step 5: Solve for x
    x = 242,053.85/760.26
  6. Step 6: Final answer
    x = 318.38

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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.