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Finding the Fourth Proportional to 760.04, 1,140.06 and 212.20

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Solution

The fourth proportional to 760.04, 1,140.06 and 212.20 is: 318.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.04 : 1,140.06 = 212.20 : x
  2. Step 2: Convert to fraction form
    760.04/1,140.06 = 212.20/x
  3. Step 3: Cross multiply
    760.04x = 1,140.06 × 212.20
  4. Step 4: Simplify right side
    760.04x = 241,920.73
  5. Step 5: Solve for x
    x = 241,920.73/760.04
  6. Step 6: Final answer
    x = 318.30

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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.