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Finding the Fourth Proportional to 1,128.93, 1,558.64 and 709.85

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Solution

The fourth proportional to 1,128.93, 1,558.64 and 709.85 is: 980.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.93 : 1,558.64 = 709.85 : x
  2. Step 2: Convert to fraction form
    1,128.93/1,558.64 = 709.85/x
  3. Step 3: Cross multiply
    1,128.93x = 1,558.64 × 709.85
  4. Step 4: Simplify right side
    1,128.93x = 1,106,400.60
  5. Step 5: Solve for x
    x = 1,106,400.60/1,128.93
  6. Step 6: Final answer
    x = 980.04

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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.