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Finding the Fourth Proportional to 666.19, 999.35 and 319.69

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Solution

The fourth proportional to 666.19, 999.35 and 319.69 is: 479.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.19 : 999.35 = 319.69 : x
  2. Step 2: Convert to fraction form
    666.19/999.35 = 319.69/x
  3. Step 3: Cross multiply
    666.19x = 999.35 × 319.69
  4. Step 4: Simplify right side
    666.19x = 319,482.20
  5. Step 5: Solve for x
    x = 319,482.20/666.19
  6. Step 6: Final answer
    x = 479.57

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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.