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Finding the Fourth Proportional to 319,491.21, 478,763.51 and 129,720.81

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Solution

The fourth proportional to 319,491.21, 478,763.51 and 129,720.81 is: 194,389.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,491.21 : 478,763.51 = 129,720.81 : x
  2. Step 2: Convert to fraction form
    319,491.21/478,763.51 = 129,720.81/x
  3. Step 3: Cross multiply
    319,491.21x = 478,763.51 × 129,720.81
  4. Step 4: Simplify right side
    319,491.21x = 62,105,589,667.04
  5. Step 5: Solve for x
    x = 62,105,589,667.04/319,491.21
  6. Step 6: Final answer
    x = 194,389.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.