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Finding the Fourth Proportional to 1,038.87, 1,431.81 and 918.18

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Solution

The fourth proportional to 1,038.87, 1,431.81 and 918.18 is: 1,265.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.87 : 1,431.81 = 918.18 : x
  2. Step 2: Convert to fraction form
    1,038.87/1,431.81 = 918.18/x
  3. Step 3: Cross multiply
    1,038.87x = 1,431.81 × 918.18
  4. Step 4: Simplify right side
    1,038.87x = 1,314,659.31
  5. Step 5: Solve for x
    x = 1,314,659.31/1,038.87
  6. Step 6: Final answer
    x = 1,265.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.