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Finding the Fourth Proportional to 72,509.28, 100,066.56 and 40,676.40

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Solution

The fourth proportional to 72,509.28, 100,066.56 and 40,676.40 is: 56,135.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,509.28 : 100,066.56 = 40,676.40 : x
  2. Step 2: Convert to fraction form
    72,509.28/100,066.56 = 40,676.40/x
  3. Step 3: Cross multiply
    72,509.28x = 100,066.56 × 40,676.40
  4. Step 4: Simplify right side
    72,509.28x = 4,070,347,421.18
  5. Step 5: Solve for x
    x = 4,070,347,421.18/72,509.28
  6. Step 6: Final answer
    x = 56,135.54

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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.