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Finding the Fourth Proportional to 152.96, 210.95 and 103.90

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Solution

The fourth proportional to 152.96, 210.95 and 103.90 is: 143.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.96 : 210.95 = 103.90 : x
  2. Step 2: Convert to fraction form
    152.96/210.95 = 103.90/x
  3. Step 3: Cross multiply
    152.96x = 210.95 × 103.90
  4. Step 4: Simplify right side
    152.96x = 21,917.71
  5. Step 5: Solve for x
    x = 21,917.71/152.96
  6. Step 6: Final answer
    x = 143.29

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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.