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Finding the Fourth Proportional to 743.40, 989.37 and 743.40

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Solution

The fourth proportional to 743.40, 989.37 and 743.40 is: 989.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.40 : 989.37 = 743.40 : x
  2. Step 2: Convert to fraction form
    743.40/989.37 = 743.40/x
  3. Step 3: Cross multiply
    743.40x = 989.37 × 743.40
  4. Step 4: Simplify right side
    743.40x = 735,497.66
  5. Step 5: Solve for x
    x = 735,497.66/743.40
  6. Step 6: Final answer
    x = 989.37

Related Problems

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