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Finding the Fourth Proportional to 2,378.70, 3,569.07 and 918.88

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Solution

The fourth proportional to 2,378.70, 3,569.07 and 918.88 is: 1,378.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,378.70 : 3,569.07 = 918.88 : x
  2. Step 2: Convert to fraction form
    2,378.70/3,569.07 = 918.88/x
  3. Step 3: Cross multiply
    2,378.70x = 3,569.07 × 918.88
  4. Step 4: Simplify right side
    2,378.70x = 3,279,547.04
  5. Step 5: Solve for x
    x = 3,279,547.04/2,378.70
  6. Step 6: Final answer
    x = 1,378.71

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1.5x scale

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.