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Finding the Fourth Proportional to 155,693.47, 214,812.53 and 87,686.66

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Solution

The fourth proportional to 155,693.47, 214,812.53 and 87,686.66 is: 120,982.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,693.47 : 214,812.53 = 87,686.66 : x
  2. Step 2: Convert to fraction form
    155,693.47/214,812.53 = 87,686.66/x
  3. Step 3: Cross multiply
    155,693.47x = 214,812.53 × 87,686.66
  4. Step 4: Simplify right side
    155,693.47x = 18,836,192,427.00
  5. Step 5: Solve for x
    x = 18,836,192,427.00/155,693.47
  6. Step 6: Final answer
    x = 120,982.55

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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.