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Finding the Fourth Proportional to 86,665.20, 121,681.20 and 86,665.20

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Solution

The fourth proportional to 86,665.20, 121,681.20 and 86,665.20 is: 121,681.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,665.20 : 121,681.20 = 86,665.20 : x
  2. Step 2: Convert to fraction form
    86,665.20/121,681.20 = 86,665.20/x
  3. Step 3: Cross multiply
    86,665.20x = 121,681.20 × 86,665.20
  4. Step 4: Simplify right side
    86,665.20x = 10,545,525,534.24
  5. Step 5: Solve for x
    x = 10,545,525,534.24/86,665.20
  6. Step 6: Final answer
    x = 121,681.20

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.