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Finding the Fourth Proportional to 93,020.40, 139,530.60 and 85,803.30

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Solution

The fourth proportional to 93,020.40, 139,530.60 and 85,803.30 is: 128,704.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,020.40 : 139,530.60 = 85,803.30 : x
  2. Step 2: Convert to fraction form
    93,020.40/139,530.60 = 85,803.30/x
  3. Step 3: Cross multiply
    93,020.40x = 139,530.60 × 85,803.30
  4. Step 4: Simplify right side
    93,020.40x = 11,972,185,930.98
  5. Step 5: Solve for x
    x = 11,972,185,930.98/93,020.40
  6. Step 6: Final answer
    x = 128,704.95

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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.