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Finding the Fourth Proportional to 426.95, 640.74 and 317.51

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Solution

The fourth proportional to 426.95, 640.74 and 317.51 is: 476.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.95 : 640.74 = 317.51 : x
  2. Step 2: Convert to fraction form
    426.95/640.74 = 317.51/x
  3. Step 3: Cross multiply
    426.95x = 640.74 × 317.51
  4. Step 4: Simplify right side
    426.95x = 203,441.36
  5. Step 5: Solve for x
    x = 203,441.36/426.95
  6. Step 6: Final answer
    x = 476.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.