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Finding the Fourth Proportional to 86,403.70, 121,315.10 and 86,403.70

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Solution

The fourth proportional to 86,403.70, 121,315.10 and 86,403.70 is: 121,315.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,403.70 : 121,315.10 = 86,403.70 : x
  2. Step 2: Convert to fraction form
    86,403.70/121,315.10 = 86,403.70/x
  3. Step 3: Cross multiply
    86,403.70x = 121,315.10 × 86,403.70
  4. Step 4: Simplify right side
    86,403.70x = 10,482,073,505.87
  5. Step 5: Solve for x
    x = 10,482,073,505.87/86,403.70
  6. Step 6: Final answer
    x = 121,315.10

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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.