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Finding the Fourth Proportional to 319,380.57, 478,931.78 and 91,625.94

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Solution

The fourth proportional to 319,380.57, 478,931.78 and 91,625.94 is: 137,399.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,380.57 : 478,931.78 = 91,625.94 : x
  2. Step 2: Convert to fraction form
    319,380.57/478,931.78 = 91,625.94/x
  3. Step 3: Cross multiply
    319,380.57x = 478,931.78 × 91,625.94
  4. Step 4: Simplify right side
    319,380.57x = 43,882,572,143.71
  5. Step 5: Solve for x
    x = 43,882,572,143.71/319,380.57
  6. Step 6: Final answer
    x = 137,399.00

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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.