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Finding the Fourth Proportional to 128,750.56, 177,675.12 and 72,162.16

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Solution

The fourth proportional to 128,750.56, 177,675.12 and 72,162.16 is: 99,583.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,750.56 : 177,675.12 = 72,162.16 : x
  2. Step 2: Convert to fraction form
    128,750.56/177,675.12 = 72,162.16/x
  3. Step 3: Cross multiply
    128,750.56x = 177,675.12 × 72,162.16
  4. Step 4: Simplify right side
    128,750.56x = 12,821,420,437.46
  5. Step 5: Solve for x
    x = 12,821,420,437.46/128,750.56
  6. Step 6: Final answer
    x = 99,583.41

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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.