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Finding the Fourth Proportional to 816.72, 1,126.96 and 485.08

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Solution

The fourth proportional to 816.72, 1,126.96 and 485.08 is: 669.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.72 : 1,126.96 = 485.08 : x
  2. Step 2: Convert to fraction form
    816.72/1,126.96 = 485.08/x
  3. Step 3: Cross multiply
    816.72x = 1,126.96 × 485.08
  4. Step 4: Simplify right side
    816.72x = 546,657.70
  5. Step 5: Solve for x
    x = 546,657.70/816.72
  6. Step 6: Final answer
    x = 669.34

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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.