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Finding the Fourth Proportional to 1,000.29, 1,491.63 and 931.05

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Solution

The fourth proportional to 1,000.29, 1,491.63 and 931.05 is: 1,388.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.29 : 1,491.63 = 931.05 : x
  2. Step 2: Convert to fraction form
    1,000.29/1,491.63 = 931.05/x
  3. Step 3: Cross multiply
    1,000.29x = 1,491.63 × 931.05
  4. Step 4: Simplify right side
    1,000.29x = 1,388,782.11
  5. Step 5: Solve for x
    x = 1,388,782.11/1,000.29
  6. Step 6: Final answer
    x = 1,388.38

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.