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Finding the Fourth Proportional to 77,989.37, 107,527.68 and 65,087.15

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Solution

The fourth proportional to 77,989.37, 107,527.68 and 65,087.15 is: 89,738.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,989.37 : 107,527.68 = 65,087.15 : x
  2. Step 2: Convert to fraction form
    77,989.37/107,527.68 = 65,087.15/x
  3. Step 3: Cross multiply
    77,989.37x = 107,527.68 × 65,087.15
  4. Step 4: Simplify right side
    77,989.37x = 6,998,669,699.67
  5. Step 5: Solve for x
    x = 6,998,669,699.67/77,989.37
  6. Step 6: Final answer
    x = 89,738.77

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1.5x scale

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.