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Finding the Fourth Proportional to 817.59, 1,128.38 and 555.69

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Solution

The fourth proportional to 817.59, 1,128.38 and 555.69 is: 766.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.59 : 1,128.38 = 555.69 : x
  2. Step 2: Convert to fraction form
    817.59/1,128.38 = 555.69/x
  3. Step 3: Cross multiply
    817.59x = 1,128.38 × 555.69
  4. Step 4: Simplify right side
    817.59x = 627,029.48
  5. Step 5: Solve for x
    x = 627,029.48/817.59
  6. Step 6: Final answer
    x = 766.92

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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.