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Finding the Fourth Proportional to 743.40, 989.40 and 743.40

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Solution

The fourth proportional to 743.40, 989.40 and 743.40 is: 989.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.40 : 989.40 = 743.40 : x
  2. Step 2: Convert to fraction form
    743.40/989.40 = 743.40/x
  3. Step 3: Cross multiply
    743.40x = 989.40 × 743.40
  4. Step 4: Simplify right side
    743.40x = 735,519.96
  5. Step 5: Solve for x
    x = 735,519.96/743.40
  6. Step 6: Final answer
    x = 989.40

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Half scale
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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 (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.