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Finding the Fourth Proportional to 1,004.31, 1,385.93 and 562.21

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Solution

The fourth proportional to 1,004.31, 1,385.93 and 562.21 is: 775.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.31 : 1,385.93 = 562.21 : x
  2. Step 2: Convert to fraction form
    1,004.31/1,385.93 = 562.21/x
  3. Step 3: Cross multiply
    1,004.31x = 1,385.93 × 562.21
  4. Step 4: Simplify right side
    1,004.31x = 779,185.11
  5. Step 5: Solve for x
    x = 779,185.11/1,004.31
  6. Step 6: Final answer
    x = 775.84

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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.