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Finding the Fourth Proportional to 810.12, 1,215.03 and 290.10

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Solution

The fourth proportional to 810.12, 1,215.03 and 290.10 is: 435.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.12 : 1,215.03 = 290.10 : x
  2. Step 2: Convert to fraction form
    810.12/1,215.03 = 290.10/x
  3. Step 3: Cross multiply
    810.12x = 1,215.03 × 290.10
  4. Step 4: Simplify right side
    810.12x = 352,480.20
  5. Step 5: Solve for x
    x = 352,480.20/810.12
  6. Step 6: Final answer
    x = 435.10

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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.