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Finding the Fourth Proportional to 686.88, 948.72 and 488.16

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Solution

The fourth proportional to 686.88, 948.72 and 488.16 is: 674.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.88 : 948.72 = 488.16 : x
  2. Step 2: Convert to fraction form
    686.88/948.72 = 488.16/x
  3. Step 3: Cross multiply
    686.88x = 948.72 × 488.16
  4. Step 4: Simplify right side
    686.88x = 463,127.16
  5. Step 5: Solve for x
    x = 463,127.16/686.88
  6. Step 6: Final answer
    x = 674.25

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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.