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Finding the Fourth Proportional to 85,830.60, 128,745.90 and 72,870.60

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Solution

The fourth proportional to 85,830.60, 128,745.90 and 72,870.60 is: 109,305.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,830.60 : 128,745.90 = 72,870.60 : x
  2. Step 2: Convert to fraction form
    85,830.60/128,745.90 = 72,870.60/x
  3. Step 3: Cross multiply
    85,830.60x = 128,745.90 × 72,870.60
  4. Step 4: Simplify right side
    85,830.60x = 9,381,790,980.54
  5. Step 5: Solve for x
    x = 9,381,790,980.54/85,830.60
  6. Step 6: Final answer
    x = 109,305.90

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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.