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Finding the Fourth Proportional to 317.70, 438.47 and 186.72

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Solution

The fourth proportional to 317.70, 438.47 and 186.72 is: 257.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.70 : 438.47 = 186.72 : x
  2. Step 2: Convert to fraction form
    317.70/438.47 = 186.72/x
  3. Step 3: Cross multiply
    317.70x = 438.47 × 186.72
  4. Step 4: Simplify right side
    317.70x = 81,870.18
  5. Step 5: Solve for x
    x = 81,870.18/317.70
  6. Step 6: Final answer
    x = 257.70

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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.