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Finding the Fourth Proportional to 318,898.66, 478,192.33 and 139,136.03

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Solution

The fourth proportional to 318,898.66, 478,192.33 and 139,136.03 is: 208,636.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,898.66 : 478,192.33 = 139,136.03 : x
  2. Step 2: Convert to fraction form
    318,898.66/478,192.33 = 139,136.03/x
  3. Step 3: Cross multiply
    318,898.66x = 478,192.33 × 139,136.03
  4. Step 4: Simplify right side
    318,898.66x = 66,533,782,340.15
  5. Step 5: Solve for x
    x = 66,533,782,340.15/318,898.66
  6. Step 6: Final answer
    x = 208,636.13

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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.