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Finding the Fourth Proportional to 457.76, 686.59 and 210.99

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Solution

The fourth proportional to 457.76, 686.59 and 210.99 is: 316.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.76 : 686.59 = 210.99 : x
  2. Step 2: Convert to fraction form
    457.76/686.59 = 210.99/x
  3. Step 3: Cross multiply
    457.76x = 686.59 × 210.99
  4. Step 4: Simplify right side
    457.76x = 144,863.62
  5. Step 5: Solve for x
    x = 144,863.62/457.76
  6. Step 6: Final answer
    x = 316.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.