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Finding the Fourth Proportional to 85,905.63, 128,780.69 and 30,488.67

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Solution

The fourth proportional to 85,905.63, 128,780.69 and 30,488.67 is: 45,705.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,905.63 : 128,780.69 = 30,488.67 : x
  2. Step 2: Convert to fraction form
    85,905.63/128,780.69 = 30,488.67/x
  3. Step 3: Cross multiply
    85,905.63x = 128,780.69 × 30,488.67
  4. Step 4: Simplify right side
    85,905.63x = 3,926,351,807.34
  5. Step 5: Solve for x
    x = 3,926,351,807.34/85,905.63
  6. Step 6: Final answer
    x = 45,705.41

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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.