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Finding the Fourth Proportional to 1,036.44, 1,430.28 and 643.44

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Solution

The fourth proportional to 1,036.44, 1,430.28 and 643.44 is: 887.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.44 : 1,430.28 = 643.44 : x
  2. Step 2: Convert to fraction form
    1,036.44/1,430.28 = 643.44/x
  3. Step 3: Cross multiply
    1,036.44x = 1,430.28 × 643.44
  4. Step 4: Simplify right side
    1,036.44x = 920,299.36
  5. Step 5: Solve for x
    x = 920,299.36/1,036.44
  6. Step 6: Final answer
    x = 887.94

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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.