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Finding the Fourth Proportional to 128,765.70, 193,148.55 and 65,780.10

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Solution

The fourth proportional to 128,765.70, 193,148.55 and 65,780.10 is: 98,670.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,765.70 : 193,148.55 = 65,780.10 : x
  2. Step 2: Convert to fraction form
    128,765.70/193,148.55 = 65,780.10/x
  3. Step 3: Cross multiply
    128,765.70x = 193,148.55 × 65,780.10
  4. Step 4: Simplify right side
    128,765.70x = 12,705,330,933.86
  5. Step 5: Solve for x
    x = 12,705,330,933.86/128,765.70
  6. Step 6: Final answer
    x = 98,670.15

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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.