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Finding the Fourth Proportional to 847.79, 1,271.35 and 539.22

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Solution

The fourth proportional to 847.79, 1,271.35 and 539.22 is: 808.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.79 : 1,271.35 = 539.22 : x
  2. Step 2: Convert to fraction form
    847.79/1,271.35 = 539.22/x
  3. Step 3: Cross multiply
    847.79x = 1,271.35 × 539.22
  4. Step 4: Simplify right side
    847.79x = 685,539.76
  5. Step 5: Solve for x
    x = 685,539.76/847.79
  6. Step 6: Final answer
    x = 808.62

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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.