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Finding the Fourth Proportional to 100,004.61, 138,019.34 and 56,999.79

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Solution

The fourth proportional to 100,004.61, 138,019.34 and 56,999.79 is: 78,667.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,004.61 : 138,019.34 = 56,999.79 : x
  2. Step 2: Convert to fraction form
    100,004.61/138,019.34 = 56,999.79/x
  3. Step 3: Cross multiply
    100,004.61x = 138,019.34 × 56,999.79
  4. Step 4: Simplify right side
    100,004.61x = 7,867,073,395.94
  5. Step 5: Solve for x
    x = 7,867,073,395.94/100,004.61
  6. Step 6: Final answer
    x = 78,667.11

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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.