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Finding the Fourth Proportional to 78,557.76, 108,410.40 and 72,604.80

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Solution

The fourth proportional to 78,557.76, 108,410.40 and 72,604.80 is: 100,195.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,557.76 : 108,410.40 = 72,604.80 : x
  2. Step 2: Convert to fraction form
    78,557.76/108,410.40 = 72,604.80/x
  3. Step 3: Cross multiply
    78,557.76x = 108,410.40 × 72,604.80
  4. Step 4: Simplify right side
    78,557.76x = 7,871,115,409.92
  5. Step 5: Solve for x
    x = 7,871,115,409.92/78,557.76
  6. Step 6: Final answer
    x = 100,195.26

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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.