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Finding the Fourth Proportional to 155,763.95, 214,955.09 and 87,781.98

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Solution

The fourth proportional to 155,763.95, 214,955.09 and 87,781.98 is: 121,139.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,763.95 : 214,955.09 = 87,781.98 : x
  2. Step 2: Convert to fraction form
    155,763.95/214,955.09 = 87,781.98/x
  3. Step 3: Cross multiply
    155,763.95x = 214,955.09 × 87,781.98
  4. Step 4: Simplify right side
    155,763.95x = 18,869,183,411.28
  5. Step 5: Solve for x
    x = 18,869,183,411.28/155,763.95
  6. Step 6: Final answer
    x = 121,139.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.