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Finding the Fourth Proportional to 561.56, 841.77 and 215.15

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Solution

The fourth proportional to 561.56, 841.77 and 215.15 is: 322.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.56 : 841.77 = 215.15 : x
  2. Step 2: Convert to fraction form
    561.56/841.77 = 215.15/x
  3. Step 3: Cross multiply
    561.56x = 841.77 × 215.15
  4. Step 4: Simplify right side
    561.56x = 181,106.82
  5. Step 5: Solve for x
    x = 181,106.82/561.56
  6. Step 6: Final answer
    x = 322.51

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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.