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Finding the Fourth Proportional to 518,291.51, 777,449.59 and 139,212.72

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Solution

The fourth proportional to 518,291.51, 777,449.59 and 139,212.72 is: 208,822.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,291.51 : 777,449.59 = 139,212.72 : x
  2. Step 2: Convert to fraction form
    518,291.51/777,449.59 = 139,212.72/x
  3. Step 3: Cross multiply
    518,291.51x = 777,449.59 × 139,212.72
  4. Step 4: Simplify right side
    518,291.51x = 108,230,871,738.75
  5. Step 5: Solve for x
    x = 108,230,871,738.75/518,291.51
  6. Step 6: Final answer
    x = 208,822.39

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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.