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Finding the Fourth Proportional to 85,703.08, 128,555.74 and 30,260.20

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Solution

The fourth proportional to 85,703.08, 128,555.74 and 30,260.20 is: 45,390.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,703.08 : 128,555.74 = 30,260.20 : x
  2. Step 2: Convert to fraction form
    85,703.08/128,555.74 = 30,260.20/x
  3. Step 3: Cross multiply
    85,703.08x = 128,555.74 × 30,260.20
  4. Step 4: Simplify right side
    85,703.08x = 3,890,122,403.55
  5. Step 5: Solve for x
    x = 3,890,122,403.55/85,703.08
  6. Step 6: Final answer
    x = 45,390.70

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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.