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Finding the Fourth Proportional to 84,970.70, 127,455.60 and 21,790.70

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Solution

The fourth proportional to 84,970.70, 127,455.60 and 21,790.70 is: 32,685.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,970.70 : 127,455.60 = 21,790.70 : x
  2. Step 2: Convert to fraction form
    84,970.70/127,455.60 = 21,790.70/x
  3. Step 3: Cross multiply
    84,970.70x = 127,455.60 × 21,790.70
  4. Step 4: Simplify right side
    84,970.70x = 2,777,346,742.92
  5. Step 5: Solve for x
    x = 2,777,346,742.92/84,970.70
  6. Step 6: Final answer
    x = 32,685.93

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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.