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Finding the Fourth Proportional to 1,989.72, 2,984.58 and 963

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Solution

The fourth proportional to 1,989.72, 2,984.58 and 963 is: 1,444.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.72 : 2,984.58 = 963 : x
  2. Step 2: Convert to fraction form
    1,989.72/2,984.58 = 963/x
  3. Step 3: Cross multiply
    1,989.72x = 2,984.58 × 963
  4. Step 4: Simplify right side
    1,989.72x = 2,874,150.54
  5. Step 5: Solve for x
    x = 2,874,150.54/1,989.72
  6. Step 6: Final answer
    x = 1,444.50

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Half scale
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Double scale
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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.