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Finding the Fourth Proportional to 85,379.08, 128,158.80 and 47,971.12

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Solution

The fourth proportional to 85,379.08, 128,158.80 and 47,971.12 is: 72,007.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,379.08 : 128,158.80 = 47,971.12 : x
  2. Step 2: Convert to fraction form
    85,379.08/128,158.80 = 47,971.12/x
  3. Step 3: Cross multiply
    85,379.08x = 128,158.80 × 47,971.12
  4. Step 4: Simplify right side
    85,379.08x = 6,147,921,173.86
  5. Step 5: Solve for x
    x = 6,147,921,173.86/85,379.08
  6. Step 6: Final answer
    x = 72,007.35

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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.