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Finding the Fourth Proportional to 272,487.70, 408,731.55 and 139,323.70

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Solution

The fourth proportional to 272,487.70, 408,731.55 and 139,323.70 is: 208,985.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,487.70 : 408,731.55 = 139,323.70 : x
  2. Step 2: Convert to fraction form
    272,487.70/408,731.55 = 139,323.70/x
  3. Step 3: Cross multiply
    272,487.70x = 408,731.55 × 139,323.70
  4. Step 4: Simplify right side
    272,487.70x = 56,945,991,852.74
  5. Step 5: Solve for x
    x = 56,945,991,852.74/272,487.70
  6. Step 6: Final answer
    x = 208,985.55

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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.