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Finding the Fourth Proportional to 1,946.93, 2,920.40 and 648.50

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Solution

The fourth proportional to 1,946.93, 2,920.40 and 648.50 is: 972.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,946.93 : 2,920.40 = 648.50 : x
  2. Step 2: Convert to fraction form
    1,946.93/2,920.40 = 648.50/x
  3. Step 3: Cross multiply
    1,946.93x = 2,920.40 × 648.50
  4. Step 4: Simplify right side
    1,946.93x = 1,893,876.16
  5. Step 5: Solve for x
    x = 1,893,876.16/1,946.93
  6. Step 6: Final answer
    x = 972.75

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Double scale
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Similar ratio
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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.