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Finding the Fourth Proportional to 1,051.32, 1,453.74 and 905.40

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Solution

The fourth proportional to 1,051.32, 1,453.74 and 905.40 is: 1,251.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.32 : 1,453.74 = 905.40 : x
  2. Step 2: Convert to fraction form
    1,051.32/1,453.74 = 905.40/x
  3. Step 3: Cross multiply
    1,051.32x = 1,453.74 × 905.40
  4. Step 4: Simplify right side
    1,051.32x = 1,316,216.20
  5. Step 5: Solve for x
    x = 1,316,216.20/1,051.32
  6. Step 6: Final answer
    x = 1,251.97

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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.