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Finding the Fourth Proportional to 561.61, 841.90 and 515.49

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Solution

The fourth proportional to 561.61, 841.90 and 515.49 is: 772.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.61 : 841.90 = 515.49 : x
  2. Step 2: Convert to fraction form
    561.61/841.90 = 515.49/x
  3. Step 3: Cross multiply
    561.61x = 841.90 × 515.49
  4. Step 4: Simplify right side
    561.61x = 433,991.03
  5. Step 5: Solve for x
    x = 433,991.03/561.61
  6. Step 6: Final answer
    x = 772.76

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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.