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Finding the Fourth Proportional to 804.95, 1,207.42 and 643.66

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Solution

The fourth proportional to 804.95, 1,207.42 and 643.66 is: 965.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.95 : 1,207.42 = 643.66 : x
  2. Step 2: Convert to fraction form
    804.95/1,207.42 = 643.66/x
  3. Step 3: Cross multiply
    804.95x = 1,207.42 × 643.66
  4. Step 4: Simplify right side
    804.95x = 777,167.96
  5. Step 5: Solve for x
    x = 777,167.96/804.95
  6. Step 6: Final answer
    x = 965.49

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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.