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Finding the Fourth Proportional to 807.56, 1,114.08 and 620.72

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Solution

The fourth proportional to 807.56, 1,114.08 and 620.72 is: 856.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.56 : 1,114.08 = 620.72 : x
  2. Step 2: Convert to fraction form
    807.56/1,114.08 = 620.72/x
  3. Step 3: Cross multiply
    807.56x = 1,114.08 × 620.72
  4. Step 4: Simplify right side
    807.56x = 691,531.74
  5. Step 5: Solve for x
    x = 691,531.74/807.56
  6. Step 6: Final answer
    x = 856.32

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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.