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Finding the Fourth Proportional to 661,543.36, 992,321.12 and 212,265.12

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Solution

The fourth proportional to 661,543.36, 992,321.12 and 212,265.12 is: 318,399.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,543.36 : 992,321.12 = 212,265.12 : x
  2. Step 2: Convert to fraction form
    661,543.36/992,321.12 = 212,265.12/x
  3. Step 3: Cross multiply
    661,543.36x = 992,321.12 × 212,265.12
  4. Step 4: Simplify right side
    661,543.36x = 210,635,161,615.33
  5. Step 5: Solve for x
    x = 210,635,161,615.33/661,543.36
  6. Step 6: Final answer
    x = 318,399.63

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Double scale
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Similar ratio
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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.