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Finding the Fourth Proportional to 1,259.78, 1,890.03 and 528.98

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Solution

The fourth proportional to 1,259.78, 1,890.03 and 528.98 is: 793.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.78 : 1,890.03 = 528.98 : x
  2. Step 2: Convert to fraction form
    1,259.78/1,890.03 = 528.98/x
  3. Step 3: Cross multiply
    1,259.78x = 1,890.03 × 528.98
  4. Step 4: Simplify right side
    1,259.78x = 999,788.07
  5. Step 5: Solve for x
    x = 999,788.07/1,259.78
  6. Step 6: Final answer
    x = 793.62

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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.