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Finding the Fourth Proportional to 940.64, 1,411.24 and 453.72

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Solution

The fourth proportional to 940.64, 1,411.24 and 453.72 is: 680.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.64 : 1,411.24 = 453.72 : x
  2. Step 2: Convert to fraction form
    940.64/1,411.24 = 453.72/x
  3. Step 3: Cross multiply
    940.64x = 1,411.24 × 453.72
  4. Step 4: Simplify right side
    940.64x = 640,307.81
  5. Step 5: Solve for x
    x = 640,307.81/940.64
  6. Step 6: Final answer
    x = 680.72

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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.