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Finding the Fourth Proportional to 210.98, 291.15 and 117.72

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Solution

The fourth proportional to 210.98, 291.15 and 117.72 is: 162.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.98 : 291.15 = 117.72 : x
  2. Step 2: Convert to fraction form
    210.98/291.15 = 117.72/x
  3. Step 3: Cross multiply
    210.98x = 291.15 × 117.72
  4. Step 4: Simplify right side
    210.98x = 34,274.18
  5. Step 5: Solve for x
    x = 34,274.18/210.98
  6. Step 6: Final answer
    x = 162.46

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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.