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Finding the Fourth Proportional to 128,415.80, 179,432.20 and 128,415.80

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Solution

The fourth proportional to 128,415.80, 179,432.20 and 128,415.80 is: 179,432.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,415.80 : 179,432.20 = 128,415.80 : x
  2. Step 2: Convert to fraction form
    128,415.80/179,432.20 = 128,415.80/x
  3. Step 3: Cross multiply
    128,415.80x = 179,432.20 × 128,415.80
  4. Step 4: Simplify right side
    128,415.80x = 23,041,929,508.76
  5. Step 5: Solve for x
    x = 23,041,929,508.76/128,415.80
  6. Step 6: Final answer
    x = 179,432.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.