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Finding the Fourth Proportional to 850.47, 1,275.81 and 302.70

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Solution

The fourth proportional to 850.47, 1,275.81 and 302.70 is: 454.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.47 : 1,275.81 = 302.70 : x
  2. Step 2: Convert to fraction form
    850.47/1,275.81 = 302.70/x
  3. Step 3: Cross multiply
    850.47x = 1,275.81 × 302.70
  4. Step 4: Simplify right side
    850.47x = 386,187.69
  5. Step 5: Solve for x
    x = 386,187.69/850.47
  6. Step 6: Final answer
    x = 454.09

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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.