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Finding the Fourth Proportional to 368.77, 508.91 and 211.40

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Solution

The fourth proportional to 368.77, 508.91 and 211.40 is: 291.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.77 : 508.91 = 211.40 : x
  2. Step 2: Convert to fraction form
    368.77/508.91 = 211.40/x
  3. Step 3: Cross multiply
    368.77x = 508.91 × 211.40
  4. Step 4: Simplify right side
    368.77x = 107,583.07
  5. Step 5: Solve for x
    x = 107,583.07/368.77
  6. Step 6: Final answer
    x = 291.74

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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.