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Finding the Fourth Proportional to 721,928.64, 993,978.96 and 635,826.72

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Solution

The fourth proportional to 721,928.64, 993,978.96 and 635,826.72 is: 875,430.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,928.64 : 993,978.96 = 635,826.72 : x
  2. Step 2: Convert to fraction form
    721,928.64/993,978.96 = 635,826.72/x
  3. Step 3: Cross multiply
    721,928.64x = 993,978.96 × 635,826.72
  4. Step 4: Simplify right side
    721,928.64x = 631,998,381,885.81
  5. Step 5: Solve for x
    x = 631,998,381,885.81/721,928.64
  6. Step 6: Final answer
    x = 875,430.54

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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.