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Finding the Fourth Proportional to 561.75, 841.89 and 388.14

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Solution

The fourth proportional to 561.75, 841.89 and 388.14 is: 581.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.75 : 841.89 = 388.14 : x
  2. Step 2: Convert to fraction form
    561.75/841.89 = 388.14/x
  3. Step 3: Cross multiply
    561.75x = 841.89 × 388.14
  4. Step 4: Simplify right side
    561.75x = 326,769.48
  5. Step 5: Solve for x
    x = 326,769.48/561.75
  6. Step 6: Final answer
    x = 581.70

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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.