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Finding the Fourth Proportional to 636,928.22, 878,595.90 and 398,049.50

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Solution

The fourth proportional to 636,928.22, 878,595.90 and 398,049.50 is: 549,080.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,928.22 : 878,595.90 = 398,049.50 : x
  2. Step 2: Convert to fraction form
    636,928.22/878,595.90 = 398,049.50/x
  3. Step 3: Cross multiply
    636,928.22x = 878,595.90 × 398,049.50
  4. Step 4: Simplify right side
    636,928.22x = 349,724,658,697.05
  5. Step 5: Solve for x
    x = 349,724,658,697.05/636,928.22
  6. Step 6: Final answer
    x = 549,080.18

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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.