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Finding the Fourth Proportional to 816.76, 1,127.58 and 620.80

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Solution

The fourth proportional to 816.76, 1,127.58 and 620.80 is: 857.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.76 : 1,127.58 = 620.80 : x
  2. Step 2: Convert to fraction form
    816.76/1,127.58 = 620.80/x
  3. Step 3: Cross multiply
    816.76x = 1,127.58 × 620.80
  4. Step 4: Simplify right side
    816.76x = 700,001.66
  5. Step 5: Solve for x
    x = 700,001.66/816.76
  6. Step 6: Final answer
    x = 857.05

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1.5x scale

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.