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Finding the Fourth Proportional to 811.51, 1,215.73 and 400.16

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Solution

The fourth proportional to 811.51, 1,215.73 and 400.16 is: 599.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.51 : 1,215.73 = 400.16 : x
  2. Step 2: Convert to fraction form
    811.51/1,215.73 = 400.16/x
  3. Step 3: Cross multiply
    811.51x = 1,215.73 × 400.16
  4. Step 4: Simplify right side
    811.51x = 486,490.06
  5. Step 5: Solve for x
    x = 486,490.06/811.51
  6. Step 6: Final answer
    x = 599.49

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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.