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Finding the Fourth Proportional to 1,079.86, 1,490.34 and 637.75

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Solution

The fourth proportional to 1,079.86, 1,490.34 and 637.75 is: 880.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.86 : 1,490.34 = 637.75 : x
  2. Step 2: Convert to fraction form
    1,079.86/1,490.34 = 637.75/x
  3. Step 3: Cross multiply
    1,079.86x = 1,490.34 × 637.75
  4. Step 4: Simplify right side
    1,079.86x = 950,464.34
  5. Step 5: Solve for x
    x = 950,464.34/1,079.86
  6. Step 6: Final answer
    x = 880.17

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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.