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Finding the Fourth Proportional to 1,029.91, 1,421.28 and 564.16

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Solution

The fourth proportional to 1,029.91, 1,421.28 and 564.16 is: 778.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.91 : 1,421.28 = 564.16 : x
  2. Step 2: Convert to fraction form
    1,029.91/1,421.28 = 564.16/x
  3. Step 3: Cross multiply
    1,029.91x = 1,421.28 × 564.16
  4. Step 4: Simplify right side
    1,029.91x = 801,829.32
  5. Step 5: Solve for x
    x = 801,829.32/1,029.91
  6. Step 6: Final answer
    x = 778.54

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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.