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Finding the Fourth Proportional to 638,903.76, 958,442.04 and 218,066.64

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Solution

The fourth proportional to 638,903.76, 958,442.04 and 218,066.64 is: 327,129.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,903.76 : 958,442.04 = 218,066.64 : x
  2. Step 2: Convert to fraction form
    638,903.76/958,442.04 = 218,066.64/x
  3. Step 3: Cross multiply
    638,903.76x = 958,442.04 × 218,066.64
  4. Step 4: Simplify right side
    638,903.76x = 209,004,235,297.55
  5. Step 5: Solve for x
    x = 209,004,235,297.55/638,903.76
  6. Step 6: Final answer
    x = 327,129.45

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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.