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Finding the Fourth Proportional to 128,675.50, 177,579.48 and 72,105.10

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Solution

The fourth proportional to 128,675.50, 177,579.48 and 72,105.10 is: 99,509.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,675.50 : 177,579.48 = 72,105.10 : x
  2. Step 2: Convert to fraction form
    128,675.50/177,579.48 = 72,105.10/x
  3. Step 3: Cross multiply
    128,675.50x = 177,579.48 × 72,105.10
  4. Step 4: Simplify right side
    128,675.50x = 12,804,386,163.35
  5. Step 5: Solve for x
    x = 12,804,386,163.35/128,675.50
  6. Step 6: Final answer
    x = 99,509.12

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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.