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Finding the Fourth Proportional to 2,838.71, 4,256.85 and 989.28

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Solution

The fourth proportional to 2,838.71, 4,256.85 and 989.28 is: 1,483.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,838.71 : 4,256.85 = 989.28 : x
  2. Step 2: Convert to fraction form
    2,838.71/4,256.85 = 989.28/x
  3. Step 3: Cross multiply
    2,838.71x = 4,256.85 × 989.28
  4. Step 4: Simplify right side
    2,838.71x = 4,211,223.56
  5. Step 5: Solve for x
    x = 4,211,223.56/2,838.71
  6. Step 6: Final answer
    x = 1,483.50

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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.