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Finding the Fourth Proportional to 954.56, 1,315.74 and 721.28

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Solution

The fourth proportional to 954.56, 1,315.74 and 721.28 is: 994.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.56 : 1,315.74 = 721.28 : x
  2. Step 2: Convert to fraction form
    954.56/1,315.74 = 721.28/x
  3. Step 3: Cross multiply
    954.56x = 1,315.74 × 721.28
  4. Step 4: Simplify right side
    954.56x = 949,016.95
  5. Step 5: Solve for x
    x = 949,016.95/954.56
  6. Step 6: Final answer
    x = 994.19

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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.