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Finding the Fourth Proportional to 955.64, 1,318.56 and 693.20

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Solution

The fourth proportional to 955.64, 1,318.56 and 693.20 is: 956.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.64 : 1,318.56 = 693.20 : x
  2. Step 2: Convert to fraction form
    955.64/1,318.56 = 693.20/x
  3. Step 3: Cross multiply
    955.64x = 1,318.56 × 693.20
  4. Step 4: Simplify right side
    955.64x = 914,025.79
  5. Step 5: Solve for x
    x = 914,025.79/955.64
  6. Step 6: Final answer
    x = 956.45

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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.