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Finding the Fourth Proportional to 312.68, 431.51 and 188.40

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Solution

The fourth proportional to 312.68, 431.51 and 188.40 is: 260.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.68 : 431.51 = 188.40 : x
  2. Step 2: Convert to fraction form
    312.68/431.51 = 188.40/x
  3. Step 3: Cross multiply
    312.68x = 431.51 × 188.40
  4. Step 4: Simplify right side
    312.68x = 81,296.48
  5. Step 5: Solve for x
    x = 81,296.48/312.68
  6. Step 6: Final answer
    x = 260.00

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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.