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Finding the Fourth Proportional to 718,305.75, 991,268.81 and 396,027.40

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Solution

The fourth proportional to 718,305.75, 991,268.81 and 396,027.40 is: 546,521.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,305.75 : 991,268.81 = 396,027.40 : x
  2. Step 2: Convert to fraction form
    718,305.75/991,268.81 = 396,027.40/x
  3. Step 3: Cross multiply
    718,305.75x = 991,268.81 × 396,027.40
  4. Step 4: Simplify right side
    718,305.75x = 392,569,609,525.39
  5. Step 5: Solve for x
    x = 392,569,609,525.39/718,305.75
  6. Step 6: Final answer
    x = 546,521.60

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1.5x scale

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.