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Finding the Fourth Proportional to 128,978.10, 193,467.15 and 97,485.30

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Solution

The fourth proportional to 128,978.10, 193,467.15 and 97,485.30 is: 146,227.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,978.10 : 193,467.15 = 97,485.30 : x
  2. Step 2: Convert to fraction form
    128,978.10/193,467.15 = 97,485.30/x
  3. Step 3: Cross multiply
    128,978.10x = 193,467.15 × 97,485.30
  4. Step 4: Simplify right side
    128,978.10x = 18,860,203,157.90
  5. Step 5: Solve for x
    x = 18,860,203,157.90/128,978.10
  6. Step 6: Final answer
    x = 146,227.95

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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.