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Finding the Fourth Proportional to 93,420, 128,919.60 and 59,886

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Solution

The fourth proportional to 93,420, 128,919.60 and 59,886 is: 82,642.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,420 : 128,919.60 = 59,886 : x
  2. Step 2: Convert to fraction form
    93,420/128,919.60 = 59,886/x
  3. Step 3: Cross multiply
    93,420x = 128,919.60 × 59,886
  4. Step 4: Simplify right side
    93,420x = 7,720,479,165.60
  5. Step 5: Solve for x
    x = 7,720,479,165.60/93,420
  6. Step 6: Final answer
    x = 82,642.68

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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.