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Finding the Fourth Proportional to 123,020.40, 184,530.60 and 78,697.20

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Solution

The fourth proportional to 123,020.40, 184,530.60 and 78,697.20 is: 118,045.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,020.40 : 184,530.60 = 78,697.20 : x
  2. Step 2: Convert to fraction form
    123,020.40/184,530.60 = 78,697.20/x
  3. Step 3: Cross multiply
    123,020.40x = 184,530.60 × 78,697.20
  4. Step 4: Simplify right side
    123,020.40x = 14,522,041,534.32
  5. Step 5: Solve for x
    x = 14,522,041,534.32/123,020.40
  6. Step 6: Final answer
    x = 118,045.80

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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.