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Finding the Fourth Proportional to 1,281.90, 1,920.14 and 589.16

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Solution

The fourth proportional to 1,281.90, 1,920.14 and 589.16 is: 882.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.90 : 1,920.14 = 589.16 : x
  2. Step 2: Convert to fraction form
    1,281.90/1,920.14 = 589.16/x
  3. Step 3: Cross multiply
    1,281.90x = 1,920.14 × 589.16
  4. Step 4: Simplify right side
    1,281.90x = 1,131,269.68
  5. Step 5: Solve for x
    x = 1,131,269.68/1,281.90
  6. Step 6: Final answer
    x = 882.49

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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.