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Finding the Fourth Proportional to 841.85, 1,261.25 and 354.03

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Solution

The fourth proportional to 841.85, 1,261.25 and 354.03 is: 530.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.85 : 1,261.25 = 354.03 : x
  2. Step 2: Convert to fraction form
    841.85/1,261.25 = 354.03/x
  3. Step 3: Cross multiply
    841.85x = 1,261.25 × 354.03
  4. Step 4: Simplify right side
    841.85x = 446,520.34
  5. Step 5: Solve for x
    x = 446,520.34/841.85
  6. Step 6: Final answer
    x = 530.40

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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.