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Finding the Fourth Proportional to 850.32, 1,274.40 and 542.06

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Solution

The fourth proportional to 850.32, 1,274.40 and 542.06 is: 812.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.32 : 1,274.40 = 542.06 : x
  2. Step 2: Convert to fraction form
    850.32/1,274.40 = 542.06/x
  3. Step 3: Cross multiply
    850.32x = 1,274.40 × 542.06
  4. Step 4: Simplify right side
    850.32x = 690,801.26
  5. Step 5: Solve for x
    x = 690,801.26/850.32
  6. Step 6: Final answer
    x = 812.40

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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.