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Finding the Fourth Proportional to 1,297.42, 1,790.44 and 707.96

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Solution

The fourth proportional to 1,297.42, 1,790.44 and 707.96 is: 976.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.42 : 1,790.44 = 707.96 : x
  2. Step 2: Convert to fraction form
    1,297.42/1,790.44 = 707.96/x
  3. Step 3: Cross multiply
    1,297.42x = 1,790.44 × 707.96
  4. Step 4: Simplify right side
    1,297.42x = 1,267,547.41
  5. Step 5: Solve for x
    x = 1,267,547.41/1,297.42
  6. Step 6: Final answer
    x = 976.98

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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.