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Finding the Fourth Proportional to 673.99, 930.23 and 643.21

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Solution

The fourth proportional to 673.99, 930.23 and 643.21 is: 887.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.99 : 930.23 = 643.21 : x
  2. Step 2: Convert to fraction form
    673.99/930.23 = 643.21/x
  3. Step 3: Cross multiply
    673.99x = 930.23 × 643.21
  4. Step 4: Simplify right side
    673.99x = 598,330.02
  5. Step 5: Solve for x
    x = 598,330.02/673.99
  6. Step 6: Final answer
    x = 887.74

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.