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Finding the Fourth Proportional to 518,857.65, 778,228.11 and 139,806.45

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Solution

The fourth proportional to 518,857.65, 778,228.11 and 139,806.45 is: 209,693.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,857.65 : 778,228.11 = 139,806.45 : x
  2. Step 2: Convert to fraction form
    518,857.65/778,228.11 = 139,806.45/x
  3. Step 3: Cross multiply
    518,857.65x = 778,228.11 × 139,806.45
  4. Step 4: Simplify right side
    518,857.65x = 108,801,309,349.31
  5. Step 5: Solve for x
    x = 108,801,309,349.31/518,857.65
  6. Step 6: Final answer
    x = 209,693.95

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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.