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Finding the Fourth Proportional to 85,804.60, 128,575.32 and 39,002.80

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Solution

The fourth proportional to 85,804.60, 128,575.32 and 39,002.80 is: 58,444.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,804.60 : 128,575.32 = 39,002.80 : x
  2. Step 2: Convert to fraction form
    85,804.60/128,575.32 = 39,002.80/x
  3. Step 3: Cross multiply
    85,804.60x = 128,575.32 × 39,002.80
  4. Step 4: Simplify right side
    85,804.60x = 5,014,797,490.90
  5. Step 5: Solve for x
    x = 5,014,797,490.90/85,804.60
  6. Step 6: Final answer
    x = 58,444.39

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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.