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Finding the Fourth Proportional to 216.51, 322.47 and 215.48

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Solution

The fourth proportional to 216.51, 322.47 and 215.48 is: 320.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.51 : 322.47 = 215.48 : x
  2. Step 2: Convert to fraction form
    216.51/322.47 = 215.48/x
  3. Step 3: Cross multiply
    216.51x = 322.47 × 215.48
  4. Step 4: Simplify right side
    216.51x = 69,484.22
  5. Step 5: Solve for x
    x = 69,484.22/216.51
  6. Step 6: Final answer
    x = 320.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.