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Finding the Fourth Proportional to 957.44, 1,321.56 and 647.12

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Solution

The fourth proportional to 957.44, 1,321.56 and 647.12 is: 893.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.44 : 1,321.56 = 647.12 : x
  2. Step 2: Convert to fraction form
    957.44/1,321.56 = 647.12/x
  3. Step 3: Cross multiply
    957.44x = 1,321.56 × 647.12
  4. Step 4: Simplify right side
    957.44x = 855,207.91
  5. Step 5: Solve for x
    x = 855,207.91/957.44
  6. Step 6: Final answer
    x = 893.22

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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.