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Finding the Fourth Proportional to 93,390, 128,878.20 and 59,856

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Solution

The fourth proportional to 93,390, 128,878.20 and 59,856 is: 82,601.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,390 : 128,878.20 = 59,856 : x
  2. Step 2: Convert to fraction form
    93,390/128,878.20 = 59,856/x
  3. Step 3: Cross multiply
    93,390x = 128,878.20 × 59,856
  4. Step 4: Simplify right side
    93,390x = 7,714,133,539.20
  5. Step 5: Solve for x
    x = 7,714,133,539.20/93,390
  6. Step 6: Final answer
    x = 82,601.28

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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.