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Finding the Fourth Proportional to 85,605.44, 128,402.40 and 30,200.64

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Solution

The fourth proportional to 85,605.44, 128,402.40 and 30,200.64 is: 45,298.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,605.44 : 128,402.40 = 30,200.64 : x
  2. Step 2: Convert to fraction form
    85,605.44/128,402.40 = 30,200.64/x
  3. Step 3: Cross multiply
    85,605.44x = 128,402.40 × 30,200.64
  4. Step 4: Simplify right side
    85,605.44x = 3,877,834,657.54
  5. Step 5: Solve for x
    x = 3,877,834,657.54/85,605.44
  6. Step 6: Final answer
    x = 45,298.93

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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.