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Finding the Fourth Proportional to 1,948.19, 2,920.43 and 648.75

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Solution

The fourth proportional to 1,948.19, 2,920.43 and 648.75 is: 972.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,948.19 : 2,920.43 = 648.75 : x
  2. Step 2: Convert to fraction form
    1,948.19/2,920.43 = 648.75/x
  3. Step 3: Cross multiply
    1,948.19x = 2,920.43 × 648.75
  4. Step 4: Simplify right side
    1,948.19x = 1,894,628.96
  5. Step 5: Solve for x
    x = 1,894,628.96/1,948.19
  6. Step 6: Final answer
    x = 972.51

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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.