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Finding the Fourth Proportional to 810.28, 1,118.40 and 679.08

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Solution

The fourth proportional to 810.28, 1,118.40 and 679.08 is: 937.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.28 : 1,118.40 = 679.08 : x
  2. Step 2: Convert to fraction form
    810.28/1,118.40 = 679.08/x
  3. Step 3: Cross multiply
    810.28x = 1,118.40 × 679.08
  4. Step 4: Simplify right side
    810.28x = 759,483.07
  5. Step 5: Solve for x
    x = 759,483.07/810.28
  6. Step 6: Final answer
    x = 937.31

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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.