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Finding the Fourth Proportional to 1,128.94, 1,558.12 and 709.66

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Solution

The fourth proportional to 1,128.94, 1,558.12 and 709.66 is: 979.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.94 : 1,558.12 = 709.66 : x
  2. Step 2: Convert to fraction form
    1,128.94/1,558.12 = 709.66/x
  3. Step 3: Cross multiply
    1,128.94x = 1,558.12 × 709.66
  4. Step 4: Simplify right side
    1,128.94x = 1,105,735.44
  5. Step 5: Solve for x
    x = 1,105,735.44/1,128.94
  6. Step 6: Final answer
    x = 979.45

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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.