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Finding the Fourth Proportional to 631,978.40, 872,140.56 and 377,351.84

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Solution

The fourth proportional to 631,978.40, 872,140.56 and 377,351.84 is: 520,751.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,978.40 : 872,140.56 = 377,351.84 : x
  2. Step 2: Convert to fraction form
    631,978.40/872,140.56 = 377,351.84/x
  3. Step 3: Cross multiply
    631,978.40x = 872,140.56 × 377,351.84
  4. Step 4: Simplify right side
    631,978.40x = 329,103,845,054.63
  5. Step 5: Solve for x
    x = 329,103,845,054.63/631,978.40
  6. Step 6: Final answer
    x = 520,751.73

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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.