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Finding the Fourth Proportional to 459.32, 688.04 and 212.17

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Solution

The fourth proportional to 459.32, 688.04 and 212.17 is: 317.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.32 : 688.04 = 212.17 : x
  2. Step 2: Convert to fraction form
    459.32/688.04 = 212.17/x
  3. Step 3: Cross multiply
    459.32x = 688.04 × 212.17
  4. Step 4: Simplify right side
    459.32x = 145,980.26
  5. Step 5: Solve for x
    x = 145,980.26/459.32
  6. Step 6: Final answer
    x = 317.82

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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.