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Finding the Fourth Proportional to 93,421, 128,932.86 and 61,656.04

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Solution

The fourth proportional to 93,421, 128,932.86 and 61,656.04 is: 85,093.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,421 : 128,932.86 = 61,656.04 : x
  2. Step 2: Convert to fraction form
    93,421/128,932.86 = 61,656.04/x
  3. Step 3: Cross multiply
    93,421x = 128,932.86 × 61,656.04
  4. Step 4: Simplify right side
    93,421x = 7,949,489,573.47
  5. Step 5: Solve for x
    x = 7,949,489,573.47/93,421
  6. Step 6: Final answer
    x = 85,093.18

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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.