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Finding the Fourth Proportional to 1,036.92, 1,430.78 and 638.45

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Solution

The fourth proportional to 1,036.92, 1,430.78 and 638.45 is: 880.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.92 : 1,430.78 = 638.45 : x
  2. Step 2: Convert to fraction form
    1,036.92/1,430.78 = 638.45/x
  3. Step 3: Cross multiply
    1,036.92x = 1,430.78 × 638.45
  4. Step 4: Simplify right side
    1,036.92x = 913,481.49
  5. Step 5: Solve for x
    x = 913,481.49/1,036.92
  6. Step 6: Final answer
    x = 880.96

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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.