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Finding the Fourth Proportional to 1,036.55, 1,431.05 and 644.10

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Solution

The fourth proportional to 1,036.55, 1,431.05 and 644.10 is: 889.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.55 : 1,431.05 = 644.10 : x
  2. Step 2: Convert to fraction form
    1,036.55/1,431.05 = 644.10/x
  3. Step 3: Cross multiply
    1,036.55x = 1,431.05 × 644.10
  4. Step 4: Simplify right side
    1,036.55x = 921,736.08
  5. Step 5: Solve for x
    x = 921,736.08/1,036.55
  6. Step 6: Final answer
    x = 889.24

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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.