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Finding the Fourth Proportional to 638,216.64, 880,889.06 and 396,681.64

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Solution

The fourth proportional to 638,216.64, 880,889.06 and 396,681.64 is: 547,513.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,216.64 : 880,889.06 = 396,681.64 : x
  2. Step 2: Convert to fraction form
    638,216.64/880,889.06 = 396,681.64/x
  3. Step 3: Cross multiply
    638,216.64x = 880,889.06 × 396,681.64
  4. Step 4: Simplify right side
    638,216.64x = 349,432,516,978.86
  5. Step 5: Solve for x
    x = 349,432,516,978.86/638,216.64
  6. Step 6: Final answer
    x = 547,513.96

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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.