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Finding the Fourth Proportional to 687.76, 948.75 and 438.82

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Solution

The fourth proportional to 687.76, 948.75 and 438.82 is: 605.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.76 : 948.75 = 438.82 : x
  2. Step 2: Convert to fraction form
    687.76/948.75 = 438.82/x
  3. Step 3: Cross multiply
    687.76x = 948.75 × 438.82
  4. Step 4: Simplify right side
    687.76x = 416,326.46
  5. Step 5: Solve for x
    x = 416,326.46/687.76
  6. Step 6: Final answer
    x = 605.34

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1.5x scale

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.