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Finding the Fourth Proportional to 306,020.40, 459,030.60 and 81,380.40

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Solution

The fourth proportional to 306,020.40, 459,030.60 and 81,380.40 is: 122,070.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    306,020.40 : 459,030.60 = 81,380.40 : x
  2. Step 2: Convert to fraction form
    306,020.40/459,030.60 = 81,380.40/x
  3. Step 3: Cross multiply
    306,020.40x = 459,030.60 × 81,380.40
  4. Step 4: Simplify right side
    306,020.40x = 37,356,093,840.24
  5. Step 5: Solve for x
    x = 37,356,093,840.24/306,020.40
  6. Step 6: Final answer
    x = 122,070.60

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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.