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Finding the Fourth Proportional to 170,978.80, 256,007.40 and 123,977.20

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Solution

The fourth proportional to 170,978.80, 256,007.40 and 123,977.20 is: 185,631.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,978.80 : 256,007.40 = 123,977.20 : x
  2. Step 2: Convert to fraction form
    170,978.80/256,007.40 = 123,977.20/x
  3. Step 3: Cross multiply
    170,978.80x = 256,007.40 × 123,977.20
  4. Step 4: Simplify right side
    170,978.80x = 31,739,080,631.28
  5. Step 5: Solve for x
    x = 31,739,080,631.28/170,978.80
  6. Step 6: Final answer
    x = 185,631.67

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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.