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Finding the Fourth Proportional to 153,640.80, 212,025.60 and 85,665.60

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Solution

The fourth proportional to 153,640.80, 212,025.60 and 85,665.60 is: 118,219.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,640.80 : 212,025.60 = 85,665.60 : x
  2. Step 2: Convert to fraction form
    153,640.80/212,025.60 = 85,665.60/x
  3. Step 3: Cross multiply
    153,640.80x = 212,025.60 × 85,665.60
  4. Step 4: Simplify right side
    153,640.80x = 18,163,300,239.36
  5. Step 5: Solve for x
    x = 18,163,300,239.36/153,640.80
  6. Step 6: Final answer
    x = 118,219.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.