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Finding the Fourth Proportional to 86,028.60, 128,999.70 and 39,228.60

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Solution

The fourth proportional to 86,028.60, 128,999.70 and 39,228.60 is: 58,823.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,028.60 : 128,999.70 = 39,228.60 : x
  2. Step 2: Convert to fraction form
    86,028.60/128,999.70 = 39,228.60/x
  3. Step 3: Cross multiply
    86,028.60x = 128,999.70 × 39,228.60
  4. Step 4: Simplify right side
    86,028.60x = 5,060,477,631.42
  5. Step 5: Solve for x
    x = 5,060,477,631.42/86,028.60
  6. Step 6: Final answer
    x = 58,823.20

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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.