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Finding the Fourth Proportional to 1,920.60, 2,881.70 and 946.71

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Solution

The fourth proportional to 1,920.60, 2,881.70 and 946.71 is: 1,420.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.60 : 2,881.70 = 946.71 : x
  2. Step 2: Convert to fraction form
    1,920.60/2,881.70 = 946.71/x
  3. Step 3: Cross multiply
    1,920.60x = 2,881.70 × 946.71
  4. Step 4: Simplify right side
    1,920.60x = 2,728,134.21
  5. Step 5: Solve for x
    x = 2,728,134.21/1,920.60
  6. Step 6: Final answer
    x = 1,420.46

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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.