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Finding the Fourth Proportional to 817.50, 1,128.15 and 507.18

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Solution

The fourth proportional to 817.50, 1,128.15 and 507.18 is: 699.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.50 : 1,128.15 = 507.18 : x
  2. Step 2: Convert to fraction form
    817.50/1,128.15 = 507.18/x
  3. Step 3: Cross multiply
    817.50x = 1,128.15 × 507.18
  4. Step 4: Simplify right side
    817.50x = 572,175.12
  5. Step 5: Solve for x
    x = 572,175.12/817.50
  6. Step 6: Final answer
    x = 699.91

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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.