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Finding the Fourth Proportional to 957.24, 1,319.78 and 691.56

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Solution

The fourth proportional to 957.24, 1,319.78 and 691.56 is: 953.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.24 : 1,319.78 = 691.56 : x
  2. Step 2: Convert to fraction form
    957.24/1,319.78 = 691.56/x
  3. Step 3: Cross multiply
    957.24x = 1,319.78 × 691.56
  4. Step 4: Simplify right side
    957.24x = 912,707.06
  5. Step 5: Solve for x
    x = 912,707.06/957.24
  6. Step 6: Final answer
    x = 953.48

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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.