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Finding the Fourth Proportional to 816.75, 1,127.14 and 485.18

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Solution

The fourth proportional to 816.75, 1,127.14 and 485.18 is: 669.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.75 : 1,127.14 = 485.18 : x
  2. Step 2: Convert to fraction form
    816.75/1,127.14 = 485.18/x
  3. Step 3: Cross multiply
    816.75x = 1,127.14 × 485.18
  4. Step 4: Simplify right side
    816.75x = 546,862.25
  5. Step 5: Solve for x
    x = 546,862.25/816.75
  6. Step 6: Final answer
    x = 669.56

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Half scale
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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.