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Finding the Fourth Proportional to 1,267.66, 1,901.42 and 390.14

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Solution

The fourth proportional to 1,267.66, 1,901.42 and 390.14 is: 585.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.66 : 1,901.42 = 390.14 : x
  2. Step 2: Convert to fraction form
    1,267.66/1,901.42 = 390.14/x
  3. Step 3: Cross multiply
    1,267.66x = 1,901.42 × 390.14
  4. Step 4: Simplify right side
    1,267.66x = 741,820.00
  5. Step 5: Solve for x
    x = 741,820.00/1,267.66
  6. Step 6: Final answer
    x = 585.19

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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.