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Finding the Fourth Proportional to 631,491.24, 871,707.24 and 389,871.48

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Solution

The fourth proportional to 631,491.24, 871,707.24 and 389,871.48 is: 538,176.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    631,491.24 : 871,707.24 = 389,871.48 : x
  2. Step 2: Convert to fraction form
    631,491.24/871,707.24 = 389,871.48/x
  3. Step 3: Cross multiply
    631,491.24x = 871,707.24 × 389,871.48
  4. Step 4: Simplify right side
    631,491.24x = 339,853,791,785.52
  5. Step 5: Solve for x
    x = 339,853,791,785.52/631,491.24
  6. Step 6: Final answer
    x = 538,176.57

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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.