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Finding the Fourth Proportional to 76,639.51, 105,753.24 and 42,639.97

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Solution

The fourth proportional to 76,639.51, 105,753.24 and 42,639.97 is: 58,837.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,639.51 : 105,753.24 = 42,639.97 : x
  2. Step 2: Convert to fraction form
    76,639.51/105,753.24 = 42,639.97/x
  3. Step 3: Cross multiply
    76,639.51x = 105,753.24 × 42,639.97
  4. Step 4: Simplify right side
    76,639.51x = 4,509,314,981.00
  5. Step 5: Solve for x
    x = 4,509,314,981.00/76,639.51
  6. Step 6: Final answer
    x = 58,837.99

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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.