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Finding the Fourth Proportional to 957.39, 1,320.62 and 608.55

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Solution

The fourth proportional to 957.39, 1,320.62 and 608.55 is: 839.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.39 : 1,320.62 = 608.55 : x
  2. Step 2: Convert to fraction form
    957.39/1,320.62 = 608.55/x
  3. Step 3: Cross multiply
    957.39x = 1,320.62 × 608.55
  4. Step 4: Simplify right side
    957.39x = 803,660.26
  5. Step 5: Solve for x
    x = 803,660.26/957.39
  6. Step 6: Final answer
    x = 839.43

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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.