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Finding the Fourth Proportional to 86,690.55, 121,211.25 and 86,690.55

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Solution

The fourth proportional to 86,690.55, 121,211.25 and 86,690.55 is: 121,211.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,690.55 : 121,211.25 = 86,690.55 : x
  2. Step 2: Convert to fraction form
    86,690.55/121,211.25 = 86,690.55/x
  3. Step 3: Cross multiply
    86,690.55x = 121,211.25 × 86,690.55
  4. Step 4: Simplify right side
    86,690.55x = 10,507,869,928.69
  5. Step 5: Solve for x
    x = 10,507,869,928.69/86,690.55
  6. Step 6: Final answer
    x = 121,211.25

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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.