Home / 89,621.80-134,432.70-85,782.40

Finding the Fourth Proportional to 89,621.80, 134,432.70 and 85,782.40

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Solution

The fourth proportional to 89,621.80, 134,432.70 and 85,782.40 is: 128,673.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,621.80 : 134,432.70 = 85,782.40 : x
  2. Step 2: Convert to fraction form
    89,621.80/134,432.70 = 85,782.40/x
  3. Step 3: Cross multiply
    89,621.80x = 134,432.70 × 85,782.40
  4. Step 4: Simplify right side
    89,621.80x = 11,531,959,644.48
  5. Step 5: Solve for x
    x = 11,531,959,644.48/89,621.80
  6. Step 6: Final answer
    x = 128,673.60

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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.