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Finding the Fourth Proportional to 760.16, 1,140.22 and 212.38

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Solution

The fourth proportional to 760.16, 1,140.22 and 212.38 is: 318.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.16 : 1,140.22 = 212.38 : x
  2. Step 2: Convert to fraction form
    760.16/1,140.22 = 212.38/x
  3. Step 3: Cross multiply
    760.16x = 1,140.22 × 212.38
  4. Step 4: Simplify right side
    760.16x = 242,159.92
  5. Step 5: Solve for x
    x = 242,159.92/760.16
  6. Step 6: Final answer
    x = 318.56

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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.