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Finding the Fourth Proportional to 1,406.32, 2,109.78 and 540.64

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Solution

The fourth proportional to 1,406.32, 2,109.78 and 540.64 is: 811.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.32 : 2,109.78 = 540.64 : x
  2. Step 2: Convert to fraction form
    1,406.32/2,109.78 = 540.64/x
  3. Step 3: Cross multiply
    1,406.32x = 2,109.78 × 540.64
  4. Step 4: Simplify right side
    1,406.32x = 1,140,631.46
  5. Step 5: Solve for x
    x = 1,140,631.46/1,406.32
  6. Step 6: Final answer
    x = 811.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.