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Finding the Fourth Proportional to 810.30, 1,118.34 and 515.34

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Solution

The fourth proportional to 810.30, 1,118.34 and 515.34 is: 711.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.30 : 1,118.34 = 515.34 : x
  2. Step 2: Convert to fraction form
    810.30/1,118.34 = 515.34/x
  3. Step 3: Cross multiply
    810.30x = 1,118.34 × 515.34
  4. Step 4: Simplify right side
    810.30x = 576,325.34
  5. Step 5: Solve for x
    x = 576,325.34/810.30
  6. Step 6: Final answer
    x = 711.25

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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.