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Finding the Fourth Proportional to 845.21, 1,267.88 and 260.15

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Solution

The fourth proportional to 845.21, 1,267.88 and 260.15 is: 390.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.21 : 1,267.88 = 260.15 : x
  2. Step 2: Convert to fraction form
    845.21/1,267.88 = 260.15/x
  3. Step 3: Cross multiply
    845.21x = 1,267.88 × 260.15
  4. Step 4: Simplify right side
    845.21x = 329,840.85
  5. Step 5: Solve for x
    x = 329,840.85/845.21
  6. Step 6: Final answer
    x = 390.25

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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.