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Finding the Fourth Proportional to 899.70, 1,242.93 and 712.59

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Solution

The fourth proportional to 899.70, 1,242.93 and 712.59 is: 984.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.70 : 1,242.93 = 712.59 : x
  2. Step 2: Convert to fraction form
    899.70/1,242.93 = 712.59/x
  3. Step 3: Cross multiply
    899.70x = 1,242.93 × 712.59
  4. Step 4: Simplify right side
    899.70x = 885,699.49
  5. Step 5: Solve for x
    x = 885,699.49/899.70
  6. Step 6: Final answer
    x = 984.44

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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.