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Finding the Fourth Proportional to 2,318.90, 3,479.76 and 859.28

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Solution

The fourth proportional to 2,318.90, 3,479.76 and 859.28 is: 1,289.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,318.90 : 3,479.76 = 859.28 : x
  2. Step 2: Convert to fraction form
    2,318.90/3,479.76 = 859.28/x
  3. Step 3: Cross multiply
    2,318.90x = 3,479.76 × 859.28
  4. Step 4: Simplify right side
    2,318.90x = 2,990,070.77
  5. Step 5: Solve for x
    x = 2,990,070.77/2,318.90
  6. Step 6: Final answer
    x = 1,289.44

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1.5x scale

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.