Home / 139,136.81-191,997.14-78,693.53

Finding the Fourth Proportional to 139,136.81, 191,997.14 and 78,693.53

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Solution

The fourth proportional to 139,136.81, 191,997.14 and 78,693.53 is: 108,590.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,136.81 : 191,997.14 = 78,693.53 : x
  2. Step 2: Convert to fraction form
    139,136.81/191,997.14 = 78,693.53/x
  3. Step 3: Cross multiply
    139,136.81x = 191,997.14 × 78,693.53
  4. Step 4: Simplify right side
    139,136.81x = 15,108,931,343.05
  5. Step 5: Solve for x
    x = 15,108,931,343.05/139,136.81
  6. Step 6: Final answer
    x = 108,590.47

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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.