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Finding the Fourth Proportional to 760.23, 1,140.28 and 212.40

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Solution

The fourth proportional to 760.23, 1,140.28 and 212.40 is: 318.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.23 : 1,140.28 = 212.40 : x
  2. Step 2: Convert to fraction form
    760.23/1,140.28 = 212.40/x
  3. Step 3: Cross multiply
    760.23x = 1,140.28 × 212.40
  4. Step 4: Simplify right side
    760.23x = 242,194.94
  5. Step 5: Solve for x
    x = 242,194.94/760.23
  6. Step 6: Final answer
    x = 318.58

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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.