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Finding the Fourth Proportional to 810.74, 1,118.56 and 479.28

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Solution

The fourth proportional to 810.74, 1,118.56 and 479.28 is: 661.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.74 : 1,118.56 = 479.28 : x
  2. Step 2: Convert to fraction form
    810.74/1,118.56 = 479.28/x
  3. Step 3: Cross multiply
    810.74x = 1,118.56 × 479.28
  4. Step 4: Simplify right side
    810.74x = 536,103.44
  5. Step 5: Solve for x
    x = 536,103.44/810.74
  6. Step 6: Final answer
    x = 661.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.