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Finding the Fourth Proportional to 631,574.78, 872,155.26 and 405,613.94

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Solution

The fourth proportional to 631,574.78, 872,155.26 and 405,613.94 is: 560,121.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,574.78 : 872,155.26 = 405,613.94 : x
  2. Step 2: Convert to fraction form
    631,574.78/872,155.26 = 405,613.94/x
  3. Step 3: Cross multiply
    631,574.78x = 872,155.26 × 405,613.94
  4. Step 4: Simplify right side
    631,574.78x = 353,758,331,300.32
  5. Step 5: Solve for x
    x = 353,758,331,300.32/631,574.78
  6. Step 6: Final answer
    x = 560,121.05

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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.