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Finding the Fourth Proportional to 811.04, 1,215.34 and 486.02

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Solution

The fourth proportional to 811.04, 1,215.34 and 486.02 is: 728.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.04 : 1,215.34 = 486.02 : x
  2. Step 2: Convert to fraction form
    811.04/1,215.34 = 486.02/x
  3. Step 3: Cross multiply
    811.04x = 1,215.34 × 486.02
  4. Step 4: Simplify right side
    811.04x = 590,681.37
  5. Step 5: Solve for x
    x = 590,681.37/811.04
  6. Step 6: Final answer
    x = 728.31

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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.