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Finding the Fourth Proportional to 128,840.80, 193,184.40 and 66,632.80

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Solution

The fourth proportional to 128,840.80, 193,184.40 and 66,632.80 is: 99,909.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,840.80 : 193,184.40 = 66,632.80 : x
  2. Step 2: Convert to fraction form
    128,840.80/193,184.40 = 66,632.80/x
  3. Step 3: Cross multiply
    128,840.80x = 193,184.40 × 66,632.80
  4. Step 4: Simplify right side
    128,840.80x = 12,872,417,488.32
  5. Step 5: Solve for x
    x = 12,872,417,488.32/128,840.80
  6. Step 6: Final answer
    x = 99,909.48

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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.