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Finding the Fourth Proportional to 368.93, 508.79 and 221.51

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Solution

The fourth proportional to 368.93, 508.79 and 221.51 is: 305.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.93 : 508.79 = 221.51 : x
  2. Step 2: Convert to fraction form
    368.93/508.79 = 221.51/x
  3. Step 3: Cross multiply
    368.93x = 508.79 × 221.51
  4. Step 4: Simplify right side
    368.93x = 112,700.08
  5. Step 5: Solve for x
    x = 112,700.08/368.93
  6. Step 6: Final answer
    x = 305.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.