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Finding the Fourth Proportional to 81,603.60, 122,405.40 and 56,720.40

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Solution

The fourth proportional to 81,603.60, 122,405.40 and 56,720.40 is: 85,080.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,603.60 : 122,405.40 = 56,720.40 : x
  2. Step 2: Convert to fraction form
    81,603.60/122,405.40 = 56,720.40/x
  3. Step 3: Cross multiply
    81,603.60x = 122,405.40 × 56,720.40
  4. Step 4: Simplify right side
    81,603.60x = 6,942,883,250.16
  5. Step 5: Solve for x
    x = 6,942,883,250.16/81,603.60
  6. Step 6: Final answer
    x = 85,080.60

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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.