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Finding the Fourth Proportional to 76,485.78, 105,491.97 and 55,335.06

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Solution

The fourth proportional to 76,485.78, 105,491.97 and 55,335.06 is: 76,320.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,485.78 : 105,491.97 = 55,335.06 : x
  2. Step 2: Convert to fraction form
    76,485.78/105,491.97 = 55,335.06/x
  3. Step 3: Cross multiply
    76,485.78x = 105,491.97 × 55,335.06
  4. Step 4: Simplify right side
    76,485.78x = 5,837,404,489.47
  5. Step 5: Solve for x
    x = 5,837,404,489.47/76,485.78
  6. Step 6: Final answer
    x = 76,320.13

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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.