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Finding the Fourth Proportional to 1,947.02, 2,920.55 and 648.45

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Solution

The fourth proportional to 1,947.02, 2,920.55 and 648.45 is: 972.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,947.02 : 2,920.55 = 648.45 : x
  2. Step 2: Convert to fraction form
    1,947.02/2,920.55 = 648.45/x
  3. Step 3: Cross multiply
    1,947.02x = 2,920.55 × 648.45
  4. Step 4: Simplify right side
    1,947.02x = 1,893,827.41
  5. Step 5: Solve for x
    x = 1,893,827.41/1,947.02
  6. Step 6: Final answer
    x = 972.68

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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.