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Finding the Fourth Proportional to 86,988.60, 121,521.60 and 86,988.60

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Solution

The fourth proportional to 86,988.60, 121,521.60 and 86,988.60 is: 121,521.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,988.60 : 121,521.60 = 86,988.60 : x
  2. Step 2: Convert to fraction form
    86,988.60/121,521.60 = 86,988.60/x
  3. Step 3: Cross multiply
    86,988.60x = 121,521.60 × 86,988.60
  4. Step 4: Simplify right side
    86,988.60x = 10,570,993,853.76
  5. Step 5: Solve for x
    x = 10,570,993,853.76/86,988.60
  6. Step 6: Final answer
    x = 121,521.60

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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.