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Finding the Fourth Proportional to 291,397.71, 436,985.83 and 139,438.79

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Solution

The fourth proportional to 291,397.71, 436,985.83 and 139,438.79 is: 209,105.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,397.71 : 436,985.83 = 139,438.79 : x
  2. Step 2: Convert to fraction form
    291,397.71/436,985.83 = 139,438.79/x
  3. Step 3: Cross multiply
    291,397.71x = 436,985.83 × 139,438.79
  4. Step 4: Simplify right side
    291,397.71x = 60,932,775,382.35
  5. Step 5: Solve for x
    x = 60,932,775,382.35/291,397.71
  6. Step 6: Final answer
    x = 209,105.20

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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.