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Finding the Fourth Proportional to 561.02, 839.10 and 543.20

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Solution

The fourth proportional to 561.02, 839.10 and 543.20 is: 812.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.02 : 839.10 = 543.20 : x
  2. Step 2: Convert to fraction form
    561.02/839.10 = 543.20/x
  3. Step 3: Cross multiply
    561.02x = 839.10 × 543.20
  4. Step 4: Simplify right side
    561.02x = 455,799.12
  5. Step 5: Solve for x
    x = 455,799.12/561.02
  6. Step 6: Final answer
    x = 812.45

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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.