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Finding the Fourth Proportional to 1,029.91, 1,421.28 and 557.81

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Solution

The fourth proportional to 1,029.91, 1,421.28 and 557.81 is: 769.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.91 : 1,421.28 = 557.81 : x
  2. Step 2: Convert to fraction form
    1,029.91/1,421.28 = 557.81/x
  3. Step 3: Cross multiply
    1,029.91x = 1,421.28 × 557.81
  4. Step 4: Simplify right side
    1,029.91x = 792,810.41
  5. Step 5: Solve for x
    x = 792,810.41/1,029.91
  6. Step 6: Final answer
    x = 769.79

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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.