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Finding the Fourth Proportional to 1,979.72, 2,970.62 and 1,159.60

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Solution

The fourth proportional to 1,979.72, 2,970.62 and 1,159.60 is: 1,740.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.72 : 2,970.62 = 1,159.60 : x
  2. Step 2: Convert to fraction form
    1,979.72/2,970.62 = 1,159.60/x
  3. Step 3: Cross multiply
    1,979.72x = 2,970.62 × 1,159.60
  4. Step 4: Simplify right side
    1,979.72x = 3,444,730.95
  5. Step 5: Solve for x
    x = 3,444,730.95/1,979.72
  6. Step 6: Final answer
    x = 1,740.01

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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.