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Finding the Fourth Proportional to 815.86, 1,223.22 and 555.22

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Solution

The fourth proportional to 815.86, 1,223.22 and 555.22 is: 832.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.86 : 1,223.22 = 555.22 : x
  2. Step 2: Convert to fraction form
    815.86/1,223.22 = 555.22/x
  3. Step 3: Cross multiply
    815.86x = 1,223.22 × 555.22
  4. Step 4: Simplify right side
    815.86x = 679,156.21
  5. Step 5: Solve for x
    x = 679,156.21/815.86
  6. Step 6: Final answer
    x = 832.44

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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.