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Finding the Fourth Proportional to 1,281.03, 1,919.86 and 510.63

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Solution

The fourth proportional to 1,281.03, 1,919.86 and 510.63 is: 765.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.03 : 1,919.86 = 510.63 : x
  2. Step 2: Convert to fraction form
    1,281.03/1,919.86 = 510.63/x
  3. Step 3: Cross multiply
    1,281.03x = 1,919.86 × 510.63
  4. Step 4: Simplify right side
    1,281.03x = 980,338.11
  5. Step 5: Solve for x
    x = 980,338.11/1,281.03
  6. Step 6: Final answer
    x = 765.27

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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.