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Finding the Fourth Proportional to 1,389.05, 1,916.87 and 829.49

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Solution

The fourth proportional to 1,389.05, 1,916.87 and 829.49 is: 1,144.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.05 : 1,916.87 = 829.49 : x
  2. Step 2: Convert to fraction form
    1,389.05/1,916.87 = 829.49/x
  3. Step 3: Cross multiply
    1,389.05x = 1,916.87 × 829.49
  4. Step 4: Simplify right side
    1,389.05x = 1,590,021.55
  5. Step 5: Solve for x
    x = 1,590,021.55/1,389.05
  6. Step 6: Final answer
    x = 1,144.68

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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.