Home / 1,314.52-1,971.09-389.95

Finding the Fourth Proportional to 1,314.52, 1,971.09 and 389.95

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Solution

The fourth proportional to 1,314.52, 1,971.09 and 389.95 is: 584.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.52 : 1,971.09 = 389.95 : x
  2. Step 2: Convert to fraction form
    1,314.52/1,971.09 = 389.95/x
  3. Step 3: Cross multiply
    1,314.52x = 1,971.09 × 389.95
  4. Step 4: Simplify right side
    1,314.52x = 768,626.55
  5. Step 5: Solve for x
    x = 768,626.55/1,314.52
  6. Step 6: Final answer
    x = 584.72

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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.