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Finding the Fourth Proportional to 72,693.39, 100,316.34 and 40,428.30

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Solution

The fourth proportional to 72,693.39, 100,316.34 and 40,428.30 is: 55,790.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,693.39 : 100,316.34 = 40,428.30 : x
  2. Step 2: Convert to fraction form
    72,693.39/100,316.34 = 40,428.30/x
  3. Step 3: Cross multiply
    72,693.39x = 100,316.34 × 40,428.30
  4. Step 4: Simplify right side
    72,693.39x = 4,055,619,088.42
  5. Step 5: Solve for x
    x = 4,055,619,088.42/72,693.39
  6. Step 6: Final answer
    x = 55,790.75

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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.