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Finding the Fourth Proportional to 128,029.60, 191,590.80 and 111,570.40

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Solution

The fourth proportional to 128,029.60, 191,590.80 and 111,570.40 is: 166,960.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,029.60 : 191,590.80 = 111,570.40 : x
  2. Step 2: Convert to fraction form
    128,029.60/191,590.80 = 111,570.40/x
  3. Step 3: Cross multiply
    128,029.60x = 191,590.80 × 111,570.40
  4. Step 4: Simplify right side
    128,029.60x = 21,375,862,192.32
  5. Step 5: Solve for x
    x = 21,375,862,192.32/128,029.60
  6. Step 6: Final answer
    x = 166,960.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.