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Finding the Fourth Proportional to 518,908.98, 778,298.96 and 139,859.34

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Solution

The fourth proportional to 518,908.98, 778,298.96 and 139,859.34 is: 209,771.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,908.98 : 778,298.96 = 139,859.34 : x
  2. Step 2: Convert to fraction form
    518,908.98/778,298.96 = 139,859.34/x
  3. Step 3: Cross multiply
    518,908.98x = 778,298.96 × 139,859.34
  4. Step 4: Simplify right side
    518,908.98x = 108,852,378,868.29
  5. Step 5: Solve for x
    x = 108,852,378,868.29/518,908.98
  6. Step 6: Final answer
    x = 209,771.62

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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.