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Finding the Fourth Proportional to 85,476.30, 128,214.45 and 76,922.70

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Solution

The fourth proportional to 85,476.30, 128,214.45 and 76,922.70 is: 115,384.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,476.30 : 128,214.45 = 76,922.70 : x
  2. Step 2: Convert to fraction form
    85,476.30/128,214.45 = 76,922.70/x
  3. Step 3: Cross multiply
    85,476.30x = 128,214.45 × 76,922.70
  4. Step 4: Simplify right side
    85,476.30x = 9,862,601,673.02
  5. Step 5: Solve for x
    x = 9,862,601,673.02/85,476.30
  6. Step 6: Final answer
    x = 115,384.05

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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.