Home / 1,212.16-1,817.56-390.24

Finding the Fourth Proportional to 1,212.16, 1,817.56 and 390.24

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Solution

The fourth proportional to 1,212.16, 1,817.56 and 390.24 is: 585.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.16 : 1,817.56 = 390.24 : x
  2. Step 2: Convert to fraction form
    1,212.16/1,817.56 = 390.24/x
  3. Step 3: Cross multiply
    1,212.16x = 1,817.56 × 390.24
  4. Step 4: Simplify right side
    1,212.16x = 709,284.61
  5. Step 5: Solve for x
    x = 709,284.61/1,212.16
  6. Step 6: Final answer
    x = 585.14

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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.