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Finding the Fourth Proportional to 899.58, 1,243.65 and 891.38

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Solution

The fourth proportional to 899.58, 1,243.65 and 891.38 is: 1,232.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.58 : 1,243.65 = 891.38 : x
  2. Step 2: Convert to fraction form
    899.58/1,243.65 = 891.38/x
  3. Step 3: Cross multiply
    899.58x = 1,243.65 × 891.38
  4. Step 4: Simplify right side
    899.58x = 1,108,564.74
  5. Step 5: Solve for x
    x = 1,108,564.74/899.58
  6. Step 6: Final answer
    x = 1,232.31

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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.