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Finding the Fourth Proportional to 369.90, 553.77 and 215.35

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Solution

The fourth proportional to 369.90, 553.77 and 215.35 is: 322.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.90 : 553.77 = 215.35 : x
  2. Step 2: Convert to fraction form
    369.90/553.77 = 215.35/x
  3. Step 3: Cross multiply
    369.90x = 553.77 × 215.35
  4. Step 4: Simplify right side
    369.90x = 119,254.37
  5. Step 5: Solve for x
    x = 119,254.37/369.90
  6. Step 6: Final answer
    x = 322.40

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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.