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Finding the Fourth Proportional to 671.36, 921.48 and 643.20

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Solution

The fourth proportional to 671.36, 921.48 and 643.20 is: 882.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.36 : 921.48 = 643.20 : x
  2. Step 2: Convert to fraction form
    671.36/921.48 = 643.20/x
  3. Step 3: Cross multiply
    671.36x = 921.48 × 643.20
  4. Step 4: Simplify right side
    671.36x = 592,695.94
  5. Step 5: Solve for x
    x = 592,695.94/671.36
  6. Step 6: Final answer
    x = 882.83

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