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Finding the Fourth Proportional to 743.45, 1,115.10 and 223.45

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Solution

The fourth proportional to 743.45, 1,115.10 and 223.45 is: 335.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    743.45 : 1,115.10 = 223.45 : x
  2. Step 2: Convert to fraction form
    743.45/1,115.10 = 223.45/x
  3. Step 3: Cross multiply
    743.45x = 1,115.10 × 223.45
  4. Step 4: Simplify right side
    743.45x = 249,166.31
  5. Step 5: Solve for x
    x = 249,166.31/743.45
  6. Step 6: Final answer
    x = 335.15

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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.