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Finding the Fourth Proportional to 817.96, 1,129.20 and 507.64

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Solution

The fourth proportional to 817.96, 1,129.20 and 507.64 is: 700.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.96 : 1,129.20 = 507.64 : x
  2. Step 2: Convert to fraction form
    817.96/1,129.20 = 507.64/x
  3. Step 3: Cross multiply
    817.96x = 1,129.20 × 507.64
  4. Step 4: Simplify right side
    817.96x = 573,227.09
  5. Step 5: Solve for x
    x = 573,227.09/817.96
  6. Step 6: Final answer
    x = 700.80

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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.