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Finding the Fourth Proportional to 953.40, 1,315.62 and 813.29

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Solution

The fourth proportional to 953.40, 1,315.62 and 813.29 is: 1,122.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.40 : 1,315.62 = 813.29 : x
  2. Step 2: Convert to fraction form
    953.40/1,315.62 = 813.29/x
  3. Step 3: Cross multiply
    953.40x = 1,315.62 × 813.29
  4. Step 4: Simplify right side
    953.40x = 1,069,979.12
  5. Step 5: Solve for x
    x = 1,069,979.12/953.40
  6. Step 6: Final answer
    x = 1,122.28

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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.