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Finding the Fourth Proportional to 93,322.98, 128,706.39 and 78,858

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Solution

The fourth proportional to 93,322.98, 128,706.39 and 78,858 is: 108,757.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    93,322.98 : 128,706.39 = 78,858 : x
  2. Step 2: Convert to fraction form
    93,322.98/128,706.39 = 78,858/x
  3. Step 3: Cross multiply
    93,322.98x = 128,706.39 × 78,858
  4. Step 4: Simplify right side
    93,322.98x = 10,149,528,502.62
  5. Step 5: Solve for x
    x = 10,149,528,502.62/93,322.98
  6. Step 6: Final answer
    x = 108,757.01

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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.