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Finding the Fourth Proportional to 128,416.90, 177,327.93 and 80,752.90

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Solution

The fourth proportional to 128,416.90, 177,327.93 and 80,752.90 is: 111,509.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,416.90 : 177,327.93 = 80,752.90 : x
  2. Step 2: Convert to fraction form
    128,416.90/177,327.93 = 80,752.90/x
  3. Step 3: Cross multiply
    128,416.90x = 177,327.93 × 80,752.90
  4. Step 4: Simplify right side
    128,416.90x = 14,319,744,598.50
  5. Step 5: Solve for x
    x = 14,319,744,598.50/128,416.90
  6. Step 6: Final answer
    x = 111,509.81

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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.