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Finding the Fourth Proportional to 319,381.32, 478,932.91 and 91,626.69

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Solution

The fourth proportional to 319,381.32, 478,932.91 and 91,626.69 is: 137,400.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,381.32 : 478,932.91 = 91,626.69 : x
  2. Step 2: Convert to fraction form
    319,381.32/478,932.91 = 91,626.69/x
  3. Step 3: Cross multiply
    319,381.32x = 478,932.91 × 91,626.69
  4. Step 4: Simplify right side
    319,381.32x = 43,883,036,817.23
  5. Step 5: Solve for x
    x = 43,883,036,817.23/319,381.32
  6. Step 6: Final answer
    x = 137,400.14

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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.