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Finding the Fourth Proportional to 810.16, 1,117.26 and 644.92

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Solution

The fourth proportional to 810.16, 1,117.26 and 644.92 is: 889.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.16 : 1,117.26 = 644.92 : x
  2. Step 2: Convert to fraction form
    810.16/1,117.26 = 644.92/x
  3. Step 3: Cross multiply
    810.16x = 1,117.26 × 644.92
  4. Step 4: Simplify right side
    810.16x = 720,540.53
  5. Step 5: Solve for x
    x = 720,540.53/810.16
  6. Step 6: Final answer
    x = 889.38

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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.