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Finding the Fourth Proportional to 2,920.40, 4,378.92 and 972.56

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Solution

The fourth proportional to 2,920.40, 4,378.92 and 972.56 is: 1,458.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.40 : 4,378.92 = 972.56 : x
  2. Step 2: Convert to fraction form
    2,920.40/4,378.92 = 972.56/x
  3. Step 3: Cross multiply
    2,920.40x = 4,378.92 × 972.56
  4. Step 4: Simplify right side
    2,920.40x = 4,258,762.44
  5. Step 5: Solve for x
    x = 4,258,762.44/2,920.40
  6. Step 6: Final answer
    x = 1,458.28

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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.