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Finding the Fourth Proportional to 86,989.60, 121,523 and 86,989.60

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Solution

The fourth proportional to 86,989.60, 121,523 and 86,989.60 is: 121,523

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,989.60 : 121,523 = 86,989.60 : x
  2. Step 2: Convert to fraction form
    86,989.60/121,523 = 86,989.60/x
  3. Step 3: Cross multiply
    86,989.60x = 121,523 × 86,989.60
  4. Step 4: Simplify right side
    86,989.60x = 10,571,237,160.80
  5. Step 5: Solve for x
    x = 10,571,237,160.80/86,989.60
  6. Step 6: Final answer
    x = 121,523

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.