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Finding the Fourth Proportional to 687.84, 948.92 and 540.90

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Solution

The fourth proportional to 687.84, 948.92 and 540.90 is: 746.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.84 : 948.92 = 540.90 : x
  2. Step 2: Convert to fraction form
    687.84/948.92 = 540.90/x
  3. Step 3: Cross multiply
    687.84x = 948.92 × 540.90
  4. Step 4: Simplify right side
    687.84x = 513,268.12
  5. Step 5: Solve for x
    x = 513,268.12/687.84
  6. Step 6: Final answer
    x = 746.20

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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.