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Finding the Fourth Proportional to 810.08, 1,215.46 and 290.16

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Solution

The fourth proportional to 810.08, 1,215.46 and 290.16 is: 435.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.08 : 1,215.46 = 290.16 : x
  2. Step 2: Convert to fraction form
    810.08/1,215.46 = 290.16/x
  3. Step 3: Cross multiply
    810.08x = 1,215.46 × 290.16
  4. Step 4: Simplify right side
    810.08x = 352,677.87
  5. Step 5: Solve for x
    x = 352,677.87/810.08
  6. Step 6: Final answer
    x = 435.36

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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.