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Finding the Fourth Proportional to 85,376.64, 128,050.44 and 31,330.20

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Solution

The fourth proportional to 85,376.64, 128,050.44 and 31,330.20 is: 46,989.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,376.64 : 128,050.44 = 31,330.20 : x
  2. Step 2: Convert to fraction form
    85,376.64/128,050.44 = 31,330.20/x
  3. Step 3: Cross multiply
    85,376.64x = 128,050.44 × 31,330.20
  4. Step 4: Simplify right side
    85,376.64x = 4,011,845,895.29
  5. Step 5: Solve for x
    x = 4,011,845,895.29/85,376.64
  6. Step 6: Final answer
    x = 46,989.97

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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.