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Finding the Third Proportional to 977.91 and 1,390.08

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Solution

The third proportional to 977.91 and 1,390.08 is: 1,975.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.91 : 1,390.08 = 1,390.08 : x
  2. Step 2: Convert to fraction form
    977.91/1,390.08 = 1,390.08/x
  3. Step 3: Cross multiply
    977.91x = 1,390.08 × 1,390.08
  4. Step 4: Simplify right side
    977.91x = 1,932,317.19
  5. Step 5: Solve for x
    x = 1,932,317.19/977.91
  6. Step 6: Final answer
    x = 1,975.97

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.