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Finding the Fourth Proportional to 1,036.86, 1,431.12 and 638.64

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Solution

The fourth proportional to 1,036.86, 1,431.12 and 638.64 is: 881.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.86 : 1,431.12 = 638.64 : x
  2. Step 2: Convert to fraction form
    1,036.86/1,431.12 = 638.64/x
  3. Step 3: Cross multiply
    1,036.86x = 1,431.12 × 638.64
  4. Step 4: Simplify right side
    1,036.86x = 913,970.48
  5. Step 5: Solve for x
    x = 913,970.48/1,036.86
  6. Step 6: Final answer
    x = 881.48

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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.