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Finding the Fourth Proportional to 128,909.40, 193,509.90 and 69,714.60

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Solution

The fourth proportional to 128,909.40, 193,509.90 and 69,714.60 is: 104,650.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,909.40 : 193,509.90 = 69,714.60 : x
  2. Step 2: Convert to fraction form
    128,909.40/193,509.90 = 69,714.60/x
  3. Step 3: Cross multiply
    128,909.40x = 193,509.90 × 69,714.60
  4. Step 4: Simplify right side
    128,909.40x = 13,490,465,274.54
  5. Step 5: Solve for x
    x = 13,490,465,274.54/128,909.40
  6. Step 6: Final answer
    x = 104,650.75

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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.