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Finding the Fourth Proportional to 86,999.80, 130,499.70 and 85,055.80

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Solution

The fourth proportional to 86,999.80, 130,499.70 and 85,055.80 is: 127,583.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,999.80 : 130,499.70 = 85,055.80 : x
  2. Step 2: Convert to fraction form
    86,999.80/130,499.70 = 85,055.80/x
  3. Step 3: Cross multiply
    86,999.80x = 130,499.70 × 85,055.80
  4. Step 4: Simplify right side
    86,999.80x = 11,099,756,383.26
  5. Step 5: Solve for x
    x = 11,099,756,383.26/86,999.80
  6. Step 6: Final answer
    x = 127,583.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.