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Finding the Fourth Proportional to 1,230.63, 1,698.29 and 706.78

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Solution

The fourth proportional to 1,230.63, 1,698.29 and 706.78 is: 975.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.63 : 1,698.29 = 706.78 : x
  2. Step 2: Convert to fraction form
    1,230.63/1,698.29 = 706.78/x
  3. Step 3: Cross multiply
    1,230.63x = 1,698.29 × 706.78
  4. Step 4: Simplify right side
    1,230.63x = 1,200,317.41
  5. Step 5: Solve for x
    x = 1,200,317.41/1,230.63
  6. Step 6: Final answer
    x = 975.37

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1.5x scale

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.