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Finding the Fourth Proportional to 921,957, 1,272,300.66 and 498,021

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Solution

The fourth proportional to 921,957, 1,272,300.66 and 498,021 is: 687,268.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    921,957 : 1,272,300.66 = 498,021 : x
  2. Step 2: Convert to fraction form
    921,957/1,272,300.66 = 498,021/x
  3. Step 3: Cross multiply
    921,957x = 1,272,300.66 × 498,021
  4. Step 4: Simplify right side
    921,957x = 633,632,446,993.86
  5. Step 5: Solve for x
    x = 633,632,446,993.86/921,957
  6. Step 6: Final answer
    x = 687,268.98

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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.