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Finding the Fourth Proportional to 673.61, 929.48 and 393.80

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Solution

The fourth proportional to 673.61, 929.48 and 393.80 is: 543.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.61 : 929.48 = 393.80 : x
  2. Step 2: Convert to fraction form
    673.61/929.48 = 393.80/x
  3. Step 3: Cross multiply
    673.61x = 929.48 × 393.80
  4. Step 4: Simplify right side
    673.61x = 366,027.26
  5. Step 5: Solve for x
    x = 366,027.26/673.61
  6. Step 6: Final answer
    x = 543.38

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