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Finding the Fourth Proportional to 86,921.10, 121,864.50 and 86,921.10

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Solution

The fourth proportional to 86,921.10, 121,864.50 and 86,921.10 is: 121,864.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,921.10 : 121,864.50 = 86,921.10 : x
  2. Step 2: Convert to fraction form
    86,921.10/121,864.50 = 86,921.10/x
  3. Step 3: Cross multiply
    86,921.10x = 121,864.50 × 86,921.10
  4. Step 4: Simplify right side
    86,921.10x = 10,592,596,390.95
  5. Step 5: Solve for x
    x = 10,592,596,390.95/86,921.10
  6. Step 6: Final answer
    x = 121,864.50

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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.