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Finding the Fourth Proportional to 72,485.96, 100,035.62 and 40,656.91

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Solution

The fourth proportional to 72,485.96, 100,035.62 and 40,656.91 is: 56,109.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,485.96 : 100,035.62 = 40,656.91 : x
  2. Step 2: Convert to fraction form
    72,485.96/100,035.62 = 40,656.91/x
  3. Step 3: Cross multiply
    72,485.96x = 100,035.62 × 40,656.91
  4. Step 4: Simplify right side
    72,485.96x = 4,067,139,199.13
  5. Step 5: Solve for x
    x = 4,067,139,199.13/72,485.96
  6. Step 6: Final answer
    x = 56,109.34

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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.