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Finding the Fourth Proportional to 84,700.64, 127,020.54 and 28,528.76

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Solution

The fourth proportional to 84,700.64, 127,020.54 and 28,528.76 is: 42,782.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,700.64 : 127,020.54 = 28,528.76 : x
  2. Step 2: Convert to fraction form
    84,700.64/127,020.54 = 28,528.76/x
  3. Step 3: Cross multiply
    84,700.64x = 127,020.54 × 28,528.76
  4. Step 4: Simplify right side
    84,700.64x = 3,623,738,500.73
  5. Step 5: Solve for x
    x = 3,623,738,500.73/84,700.64
  6. Step 6: Final answer
    x = 42,782.89

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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.