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Finding the Fourth Proportional to 189.15, 260.85 and 152.31

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Solution

The fourth proportional to 189.15, 260.85 and 152.31 is: 210.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.15 : 260.85 = 152.31 : x
  2. Step 2: Convert to fraction form
    189.15/260.85 = 152.31/x
  3. Step 3: Cross multiply
    189.15x = 260.85 × 152.31
  4. Step 4: Simplify right side
    189.15x = 39,730.06
  5. Step 5: Solve for x
    x = 39,730.06/189.15
  6. Step 6: Final answer
    x = 210.05

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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.