Home / 1,314.60-1,971.88-390.15

Finding the Fourth Proportional to 1,314.60, 1,971.88 and 390.15

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Solution

The fourth proportional to 1,314.60, 1,971.88 and 390.15 is: 585.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,314.60 : 1,971.88 = 390.15 : x
  2. Step 2: Convert to fraction form
    1,314.60/1,971.88 = 390.15/x
  3. Step 3: Cross multiply
    1,314.60x = 1,971.88 × 390.15
  4. Step 4: Simplify right side
    1,314.60x = 769,328.98
  5. Step 5: Solve for x
    x = 769,328.98/1,314.60
  6. Step 6: Final answer
    x = 585.22

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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.