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Finding the Fourth Proportional to 77,303.43, 115,958.64 and 21,142.28

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Solution

The fourth proportional to 77,303.43, 115,958.64 and 21,142.28 is: 31,714.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,303.43 : 115,958.64 = 21,142.28 : x
  2. Step 2: Convert to fraction form
    77,303.43/115,958.64 = 21,142.28/x
  3. Step 3: Cross multiply
    77,303.43x = 115,958.64 × 21,142.28
  4. Step 4: Simplify right side
    77,303.43x = 2,451,630,285.55
  5. Step 5: Solve for x
    x = 2,451,630,285.55/77,303.43
  6. Step 6: Final answer
    x = 31,714.38

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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.