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Finding the Fourth Proportional to 92,964.80, 128,238 and 57,129.32

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Solution

The fourth proportional to 92,964.80, 128,238 and 57,129.32 is: 78,805.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,964.80 : 128,238 = 57,129.32 : x
  2. Step 2: Convert to fraction form
    92,964.80/128,238 = 57,129.32/x
  3. Step 3: Cross multiply
    92,964.80x = 128,238 × 57,129.32
  4. Step 4: Simplify right side
    92,964.80x = 7,326,149,738.16
  5. Step 5: Solve for x
    x = 7,326,149,738.16/92,964.80
  6. Step 6: Final answer
    x = 78,805.63

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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.