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Finding the Fourth Proportional to 128,612.10, 177,430.20 and 80,848.02

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Solution

The fourth proportional to 128,612.10, 177,430.20 and 80,848.02 is: 111,536.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,612.10 : 177,430.20 = 80,848.02 : x
  2. Step 2: Convert to fraction form
    128,612.10/177,430.20 = 80,848.02/x
  3. Step 3: Cross multiply
    128,612.10x = 177,430.20 × 80,848.02
  4. Step 4: Simplify right side
    128,612.10x = 14,344,880,720.39
  5. Step 5: Solve for x
    x = 14,344,880,720.39/128,612.10
  6. Step 6: Final answer
    x = 111,536.01

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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.