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Finding the Fourth Proportional to 561.72, 841.86 and 287.22

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Solution

The fourth proportional to 561.72, 841.86 and 287.22 is: 430.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.72 : 841.86 = 287.22 : x
  2. Step 2: Convert to fraction form
    561.72/841.86 = 287.22/x
  3. Step 3: Cross multiply
    561.72x = 841.86 × 287.22
  4. Step 4: Simplify right side
    561.72x = 241,799.03
  5. Step 5: Solve for x
    x = 241,799.03/561.72
  6. Step 6: Final answer
    x = 430.46

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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.