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Finding the Fourth Proportional to 1,959.16, 2,938.59 and 918.89

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Solution

The fourth proportional to 1,959.16, 2,938.59 and 918.89 is: 1,378.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.16 : 2,938.59 = 918.89 : x
  2. Step 2: Convert to fraction form
    1,959.16/2,938.59 = 918.89/x
  3. Step 3: Cross multiply
    1,959.16x = 2,938.59 × 918.89
  4. Step 4: Simplify right side
    1,959.16x = 2,700,240.97
  5. Step 5: Solve for x
    x = 2,700,240.97/1,959.16
  6. Step 6: Final answer
    x = 1,378.26

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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.