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Finding the Fourth Proportional to 1,297.32, 1,790.30 and 707.89

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Solution

The fourth proportional to 1,297.32, 1,790.30 and 707.89 is: 976.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.32 : 1,790.30 = 707.89 : x
  2. Step 2: Convert to fraction form
    1,297.32/1,790.30 = 707.89/x
  3. Step 3: Cross multiply
    1,297.32x = 1,790.30 × 707.89
  4. Step 4: Simplify right side
    1,297.32x = 1,267,330.11
  5. Step 5: Solve for x
    x = 1,267,330.11/1,297.32
  6. Step 6: Final answer
    x = 976.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.