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Finding the Fourth Proportional to 1,231, 1,698.78 and 707.02

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Solution

The fourth proportional to 1,231, 1,698.78 and 707.02 is: 975.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231 : 1,698.78 = 707.02 : x
  2. Step 2: Convert to fraction form
    1,231/1,698.78 = 707.02/x
  3. Step 3: Cross multiply
    1,231x = 1,698.78 × 707.02
  4. Step 4: Simplify right side
    1,231x = 1,201,071.44
  5. Step 5: Solve for x
    x = 1,201,071.44/1,231
  6. Step 6: Final answer
    x = 975.69

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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.