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Finding the Fourth Proportional to 561.48, 841.49 and 287.66

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Solution

The fourth proportional to 561.48, 841.49 and 287.66 is: 431.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.48 : 841.49 = 287.66 : x
  2. Step 2: Convert to fraction form
    561.48/841.49 = 287.66/x
  3. Step 3: Cross multiply
    561.48x = 841.49 × 287.66
  4. Step 4: Simplify right side
    561.48x = 242,064.76
  5. Step 5: Solve for x
    x = 242,064.76/561.48
  6. Step 6: Final answer
    x = 431.12

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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.