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Finding the Fourth Proportional to 93,420.88, 128,735.96 and 66,488

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Solution

The fourth proportional to 93,420.88, 128,735.96 and 66,488 is: 91,621.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,420.88 : 128,735.96 = 66,488 : x
  2. Step 2: Convert to fraction form
    93,420.88/128,735.96 = 66,488/x
  3. Step 3: Cross multiply
    93,420.88x = 128,735.96 × 66,488
  4. Step 4: Simplify right side
    93,420.88x = 8,559,396,508.48
  5. Step 5: Solve for x
    x = 8,559,396,508.48/93,420.88
  6. Step 6: Final answer
    x = 91,621.88

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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.