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Finding the Fourth Proportional to 93,321, 139,995.60 and 30,120

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Solution

The fourth proportional to 93,321, 139,995.60 and 30,120 is: 45,184.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,321 : 139,995.60 = 30,120 : x
  2. Step 2: Convert to fraction form
    93,321/139,995.60 = 30,120/x
  3. Step 3: Cross multiply
    93,321x = 139,995.60 × 30,120
  4. Step 4: Simplify right side
    93,321x = 4,216,667,472
  5. Step 5: Solve for x
    x = 4,216,667,472/93,321
  6. Step 6: Final answer
    x = 45,184.55

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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.