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Finding the Fourth Proportional to 885.15, 1,221.33 and 569.92

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Solution

The fourth proportional to 885.15, 1,221.33 and 569.92 is: 786.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.15 : 1,221.33 = 569.92 : x
  2. Step 2: Convert to fraction form
    885.15/1,221.33 = 569.92/x
  3. Step 3: Cross multiply
    885.15x = 1,221.33 × 569.92
  4. Step 4: Simplify right side
    885.15x = 696,060.39
  5. Step 5: Solve for x
    x = 696,060.39/885.15
  6. Step 6: Final answer
    x = 786.38

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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.