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Finding the Fourth Proportional to 90,978.40, 136,467.60 and 82,813.60

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Solution

The fourth proportional to 90,978.40, 136,467.60 and 82,813.60 is: 124,220.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,978.40 : 136,467.60 = 82,813.60 : x
  2. Step 2: Convert to fraction form
    90,978.40/136,467.60 = 82,813.60/x
  3. Step 3: Cross multiply
    90,978.40x = 136,467.60 × 82,813.60
  4. Step 4: Simplify right side
    90,978.40x = 11,301,373,239.36
  5. Step 5: Solve for x
    x = 11,301,373,239.36/90,978.40
  6. Step 6: Final answer
    x = 124,220.40

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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.