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Finding the Fourth Proportional to 561.29, 841.91 and 287.28

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Solution

The fourth proportional to 561.29, 841.91 and 287.28 is: 430.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.29 : 841.91 = 287.28 : x
  2. Step 2: Convert to fraction form
    561.29/841.91 = 287.28/x
  3. Step 3: Cross multiply
    561.29x = 841.91 × 287.28
  4. Step 4: Simplify right side
    561.29x = 241,862.47
  5. Step 5: Solve for x
    x = 241,862.47/561.29
  6. Step 6: Final answer
    x = 430.91

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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.