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Finding the Fourth Proportional to 111,237.88, 153,529.62 and 86,990.80

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Solution

The fourth proportional to 111,237.88, 153,529.62 and 86,990.80 is: 120,064.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,237.88 : 153,529.62 = 86,990.80 : x
  2. Step 2: Convert to fraction form
    111,237.88/153,529.62 = 86,990.80/x
  3. Step 3: Cross multiply
    111,237.88x = 153,529.62 × 86,990.80
  4. Step 4: Simplify right side
    111,237.88x = 13,355,664,467.50
  5. Step 5: Solve for x
    x = 13,355,664,467.50/111,237.88
  6. Step 6: Final answer
    x = 120,064.00

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.