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Finding the Fourth Proportional to 959.32, 1,439.19 and 310.05

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Solution

The fourth proportional to 959.32, 1,439.19 and 310.05 is: 465.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.32 : 1,439.19 = 310.05 : x
  2. Step 2: Convert to fraction form
    959.32/1,439.19 = 310.05/x
  3. Step 3: Cross multiply
    959.32x = 1,439.19 × 310.05
  4. Step 4: Simplify right side
    959.32x = 446,220.86
  5. Step 5: Solve for x
    x = 446,220.86/959.32
  6. Step 6: Final answer
    x = 465.14

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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.