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Finding the Fourth Proportional to 170,782.60, 256,246.80 and 81,990.40

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Solution

The fourth proportional to 170,782.60, 256,246.80 and 81,990.40 is: 123,020.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,782.60 : 256,246.80 = 81,990.40 : x
  2. Step 2: Convert to fraction form
    170,782.60/256,246.80 = 81,990.40/x
  3. Step 3: Cross multiply
    170,782.60x = 256,246.80 × 81,990.40
  4. Step 4: Simplify right side
    170,782.60x = 21,009,777,630.72
  5. Step 5: Solve for x
    x = 21,009,777,630.72/170,782.60
  6. Step 6: Final answer
    x = 123,020.60

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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.