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Finding the Fourth Proportional to 817.14, 1,127.64 and 485.74

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Solution

The fourth proportional to 817.14, 1,127.64 and 485.74 is: 670.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.14 : 1,127.64 = 485.74 : x
  2. Step 2: Convert to fraction form
    817.14/1,127.64 = 485.74/x
  3. Step 3: Cross multiply
    817.14x = 1,127.64 × 485.74
  4. Step 4: Simplify right side
    817.14x = 547,739.85
  5. Step 5: Solve for x
    x = 547,739.85/817.14
  6. Step 6: Final answer
    x = 670.31

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Double scale
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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.