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Finding the Fourth Proportional to 86,321, 128,875.96 and 73,038.56

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Solution

The fourth proportional to 86,321, 128,875.96 and 73,038.56 is: 109,045.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,321 : 128,875.96 = 73,038.56 : x
  2. Step 2: Convert to fraction form
    86,321/128,875.96 = 73,038.56/x
  3. Step 3: Cross multiply
    86,321x = 128,875.96 × 73,038.56
  4. Step 4: Simplify right side
    86,321x = 9,412,914,537.02
  5. Step 5: Solve for x
    x = 9,412,914,537.02/86,321
  6. Step 6: Final answer
    x = 109,045.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.