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Finding the Fourth Proportional to 578,721.60, 867,790.80 and 342,136.80

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Solution

The fourth proportional to 578,721.60, 867,790.80 and 342,136.80 is: 513,032.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,721.60 : 867,790.80 = 342,136.80 : x
  2. Step 2: Convert to fraction form
    578,721.60/867,790.80 = 342,136.80/x
  3. Step 3: Cross multiply
    578,721.60x = 867,790.80 × 342,136.80
  4. Step 4: Simplify right side
    578,721.60x = 296,903,167,381.44
  5. Step 5: Solve for x
    x = 296,903,167,381.44/578,721.60
  6. Step 6: Final answer
    x = 513,032.81

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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.