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Finding the Fourth Proportional to 1,238.66, 1,709.19 and 707.60

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Solution

The fourth proportional to 1,238.66, 1,709.19 and 707.60 is: 976.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.66 : 1,709.19 = 707.60 : x
  2. Step 2: Convert to fraction form
    1,238.66/1,709.19 = 707.60/x
  3. Step 3: Cross multiply
    1,238.66x = 1,709.19 × 707.60
  4. Step 4: Simplify right side
    1,238.66x = 1,209,422.84
  5. Step 5: Solve for x
    x = 1,209,422.84/1,238.66
  6. Step 6: Final answer
    x = 976.40

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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.