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Finding the Fourth Proportional to 687.48, 948.60 and 425.58

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Solution

The fourth proportional to 687.48, 948.60 and 425.58 is: 587.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.48 : 948.60 = 425.58 : x
  2. Step 2: Convert to fraction form
    687.48/948.60 = 425.58/x
  3. Step 3: Cross multiply
    687.48x = 948.60 × 425.58
  4. Step 4: Simplify right side
    687.48x = 403,705.19
  5. Step 5: Solve for x
    x = 403,705.19/687.48
  6. Step 6: Final answer
    x = 587.22

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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.