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Finding the Fourth Proportional to 847.39, 1,271.35 and 436.79

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Solution

The fourth proportional to 847.39, 1,271.35 and 436.79 is: 655.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.39 : 1,271.35 = 436.79 : x
  2. Step 2: Convert to fraction form
    847.39/1,271.35 = 436.79/x
  3. Step 3: Cross multiply
    847.39x = 1,271.35 × 436.79
  4. Step 4: Simplify right side
    847.39x = 555,314.23
  5. Step 5: Solve for x
    x = 555,314.23/847.39
  6. Step 6: Final answer
    x = 655.33

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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.