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Finding the Fourth Proportional to 810.64, 1,216.22 and 290.63

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Solution

The fourth proportional to 810.64, 1,216.22 and 290.63 is: 436.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.64 : 1,216.22 = 290.63 : x
  2. Step 2: Convert to fraction form
    810.64/1,216.22 = 290.63/x
  3. Step 3: Cross multiply
    810.64x = 1,216.22 × 290.63
  4. Step 4: Simplify right side
    810.64x = 353,468.57
  5. Step 5: Solve for x
    x = 353,468.57/810.64
  6. Step 6: Final answer
    x = 436.04

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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.