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Finding the Fourth Proportional to 85,980.20, 128,970.30 and 75,612.20

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Solution

The fourth proportional to 85,980.20, 128,970.30 and 75,612.20 is: 113,418.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,980.20 : 128,970.30 = 75,612.20 : x
  2. Step 2: Convert to fraction form
    85,980.20/128,970.30 = 75,612.20/x
  3. Step 3: Cross multiply
    85,980.20x = 128,970.30 × 75,612.20
  4. Step 4: Simplify right side
    85,980.20x = 9,751,728,117.66
  5. Step 5: Solve for x
    x = 9,751,728,117.66/85,980.20
  6. Step 6: Final answer
    x = 113,418.30

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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.