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Finding the Fourth Proportional to 687.93, 948.95 and 425.76

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Solution

The fourth proportional to 687.93, 948.95 and 425.76 is: 587.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.93 : 948.95 = 425.76 : x
  2. Step 2: Convert to fraction form
    687.93/948.95 = 425.76/x
  3. Step 3: Cross multiply
    687.93x = 948.95 × 425.76
  4. Step 4: Simplify right side
    687.93x = 404,022.82
  5. Step 5: Solve for x
    x = 404,022.82/687.93
  6. Step 6: Final answer
    x = 587.30

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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.