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Finding the Fourth Proportional to 77,642.73, 107,165.75 and 72,389.61

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Solution

The fourth proportional to 77,642.73, 107,165.75 and 72,389.61 is: 99,915.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,642.73 : 107,165.75 = 72,389.61 : x
  2. Step 2: Convert to fraction form
    77,642.73/107,165.75 = 72,389.61/x
  3. Step 3: Cross multiply
    77,642.73x = 107,165.75 × 72,389.61
  4. Step 4: Simplify right side
    77,642.73x = 7,757,686,485.91
  5. Step 5: Solve for x
    x = 7,757,686,485.91/77,642.73
  6. Step 6: Final answer
    x = 99,915.17

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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.