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Finding the Fourth Proportional to 990.26, 1,483.56 and 715.67

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Solution

The fourth proportional to 990.26, 1,483.56 and 715.67 is: 1,072.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.26 : 1,483.56 = 715.67 : x
  2. Step 2: Convert to fraction form
    990.26/1,483.56 = 715.67/x
  3. Step 3: Cross multiply
    990.26x = 1,483.56 × 715.67
  4. Step 4: Simplify right side
    990.26x = 1,061,746.29
  5. Step 5: Solve for x
    x = 1,061,746.29/990.26
  6. Step 6: Final answer
    x = 1,072.19

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.