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Finding the Fourth Proportional to 1,026.66, 1,415.29 and 816.92

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Solution

The fourth proportional to 1,026.66, 1,415.29 and 816.92 is: 1,126.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,026.66 : 1,415.29 = 816.92 : x
  2. Step 2: Convert to fraction form
    1,026.66/1,415.29 = 816.92/x
  3. Step 3: Cross multiply
    1,026.66x = 1,415.29 × 816.92
  4. Step 4: Simplify right side
    1,026.66x = 1,156,167.55
  5. Step 5: Solve for x
    x = 1,156,167.55/1,026.66
  6. Step 6: Final answer
    x = 1,126.14

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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.