Home / 1,314.18-1,971.54-389.75

Finding the Fourth Proportional to 1,314.18, 1,971.54 and 389.75

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Solution

The fourth proportional to 1,314.18, 1,971.54 and 389.75 is: 584.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.18 : 1,971.54 = 389.75 : x
  2. Step 2: Convert to fraction form
    1,314.18/1,971.54 = 389.75/x
  3. Step 3: Cross multiply
    1,314.18x = 1,971.54 × 389.75
  4. Step 4: Simplify right side
    1,314.18x = 768,397.86
  5. Step 5: Solve for x
    x = 768,397.86/1,314.18
  6. Step 6: Final answer
    x = 584.70

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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.