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Finding the Fourth Proportional to 722,688.64, 997,268.65 and 400,379.51

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Solution

The fourth proportional to 722,688.64, 997,268.65 and 400,379.51 is: 552,500.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,688.64 : 997,268.65 = 400,379.51 : x
  2. Step 2: Convert to fraction form
    722,688.64/997,268.65 = 400,379.51/x
  3. Step 3: Cross multiply
    722,688.64x = 997,268.65 × 400,379.51
  4. Step 4: Simplify right side
    722,688.64x = 399,285,934,917.58
  5. Step 5: Solve for x
    x = 399,285,934,917.58/722,688.64
  6. Step 6: Final answer
    x = 552,500.64

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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.