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Finding the Fourth Proportional to 673.40, 921.10 and 657.20

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Solution

The fourth proportional to 673.40, 921.10 and 657.20 is: 898.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.40 : 921.10 = 657.20 : x
  2. Step 2: Convert to fraction form
    673.40/921.10 = 657.20/x
  3. Step 3: Cross multiply
    673.40x = 921.10 × 657.20
  4. Step 4: Simplify right side
    673.40x = 605,346.92
  5. Step 5: Solve for x
    x = 605,346.92/673.40
  6. Step 6: Final answer
    x = 898.94

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.