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Finding the Fourth Proportional to 72,688.80, 100,243.80 and 47,168.40

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Solution

The fourth proportional to 72,688.80, 100,243.80 and 47,168.40 is: 65,049.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,688.80 : 100,243.80 = 47,168.40 : x
  2. Step 2: Convert to fraction form
    72,688.80/100,243.80 = 47,168.40/x
  3. Step 3: Cross multiply
    72,688.80x = 100,243.80 × 47,168.40
  4. Step 4: Simplify right side
    72,688.80x = 4,728,339,655.92
  5. Step 5: Solve for x
    x = 4,728,339,655.92/72,688.80
  6. Step 6: Final answer
    x = 65,049.08

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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.