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Finding the Fourth Proportional to 953.64, 1,428.86 and 661.24

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Solution

The fourth proportional to 953.64, 1,428.86 and 661.24 is: 990.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.64 : 1,428.86 = 661.24 : x
  2. Step 2: Convert to fraction form
    953.64/1,428.86 = 661.24/x
  3. Step 3: Cross multiply
    953.64x = 1,428.86 × 661.24
  4. Step 4: Simplify right side
    953.64x = 944,819.39
  5. Step 5: Solve for x
    x = 944,819.39/953.64
  6. Step 6: Final answer
    x = 990.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.