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Finding the Fourth Proportional to 2,919.50, 4,378.30 and 971.18

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Solution

The fourth proportional to 2,919.50, 4,378.30 and 971.18 is: 1,456.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,919.50 : 4,378.30 = 971.18 : x
  2. Step 2: Convert to fraction form
    2,919.50/4,378.30 = 971.18/x
  3. Step 3: Cross multiply
    2,919.50x = 4,378.30 × 971.18
  4. Step 4: Simplify right side
    2,919.50x = 4,252,117.39
  5. Step 5: Solve for x
    x = 4,252,117.39/2,919.50
  6. Step 6: Final answer
    x = 1,456.45

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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.