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Finding the Fourth Proportional to 1,008.45, 1,391.85 and 589.05

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Solution

The fourth proportional to 1,008.45, 1,391.85 and 589.05 is: 813.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.45 : 1,391.85 = 589.05 : x
  2. Step 2: Convert to fraction form
    1,008.45/1,391.85 = 589.05/x
  3. Step 3: Cross multiply
    1,008.45x = 1,391.85 × 589.05
  4. Step 4: Simplify right side
    1,008.45x = 819,869.24
  5. Step 5: Solve for x
    x = 819,869.24/1,008.45
  6. Step 6: Final answer
    x = 813.00

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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.