Home / 212,720.78-319,136.52-79,611.50

Finding the Fourth Proportional to 212,720.78, 319,136.52 and 79,611.50

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Solution

The fourth proportional to 212,720.78, 319,136.52 and 79,611.50 is: 119,437.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,720.78 : 319,136.52 = 79,611.50 : x
  2. Step 2: Convert to fraction form
    212,720.78/319,136.52 = 79,611.50/x
  3. Step 3: Cross multiply
    212,720.78x = 319,136.52 × 79,611.50
  4. Step 4: Simplify right side
    212,720.78x = 25,406,937,061.98
  5. Step 5: Solve for x
    x = 25,406,937,061.98/212,720.78
  6. Step 6: Final answer
    x = 119,437.96

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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.