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Finding the Fourth Proportional to 808.56, 1,114.32 and 621.12

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Solution

The fourth proportional to 808.56, 1,114.32 and 621.12 is: 856.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.56 : 1,114.32 = 621.12 : x
  2. Step 2: Convert to fraction form
    808.56/1,114.32 = 621.12/x
  3. Step 3: Cross multiply
    808.56x = 1,114.32 × 621.12
  4. Step 4: Simplify right side
    808.56x = 692,126.44
  5. Step 5: Solve for x
    x = 692,126.44/808.56
  6. Step 6: Final answer
    x = 856.00

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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.