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Finding the Fourth Proportional to 128,816.32, 177,762.72 and 72,230.08

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Solution

The fourth proportional to 128,816.32, 177,762.72 and 72,230.08 is: 99,675.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,816.32 : 177,762.72 = 72,230.08 : x
  2. Step 2: Convert to fraction form
    128,816.32/177,762.72 = 72,230.08/x
  3. Step 3: Cross multiply
    128,816.32x = 177,762.72 × 72,230.08
  4. Step 4: Simplify right side
    128,816.32x = 12,839,815,486.62
  5. Step 5: Solve for x
    x = 12,839,815,486.62/128,816.32
  6. Step 6: Final answer
    x = 99,675.38

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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.