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Finding the Fourth Proportional to 899.04, 1,240.36 and 689.28

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Solution

The fourth proportional to 899.04, 1,240.36 and 689.28 is: 950.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.04 : 1,240.36 = 689.28 : x
  2. Step 2: Convert to fraction form
    899.04/1,240.36 = 689.28/x
  3. Step 3: Cross multiply
    899.04x = 1,240.36 × 689.28
  4. Step 4: Simplify right side
    899.04x = 854,955.34
  5. Step 5: Solve for x
    x = 854,955.34/899.04
  6. Step 6: Final answer
    x = 950.96

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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.