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Finding the Fourth Proportional to 810.43, 1,215.52 and 262.53

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Solution

The fourth proportional to 810.43, 1,215.52 and 262.53 is: 393.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.43 : 1,215.52 = 262.53 : x
  2. Step 2: Convert to fraction form
    810.43/1,215.52 = 262.53/x
  3. Step 3: Cross multiply
    810.43x = 1,215.52 × 262.53
  4. Step 4: Simplify right side
    810.43x = 319,109.81
  5. Step 5: Solve for x
    x = 319,109.81/810.43
  6. Step 6: Final answer
    x = 393.75

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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.