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Finding the Fourth Proportional to 817.56, 1,130.76 and 642.26

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Solution

The fourth proportional to 817.56, 1,130.76 and 642.26 is: 888.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.56 : 1,130.76 = 642.26 : x
  2. Step 2: Convert to fraction form
    817.56/1,130.76 = 642.26/x
  3. Step 3: Cross multiply
    817.56x = 1,130.76 × 642.26
  4. Step 4: Simplify right side
    817.56x = 726,244.74
  5. Step 5: Solve for x
    x = 726,244.74/817.56
  6. Step 6: Final answer
    x = 888.31

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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.