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Finding the Fourth Proportional to 941.40, 1,297.80 and 646.20

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Solution

The fourth proportional to 941.40, 1,297.80 and 646.20 is: 890.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.40 : 1,297.80 = 646.20 : x
  2. Step 2: Convert to fraction form
    941.40/1,297.80 = 646.20/x
  3. Step 3: Cross multiply
    941.40x = 1,297.80 × 646.20
  4. Step 4: Simplify right side
    941.40x = 838,638.36
  5. Step 5: Solve for x
    x = 838,638.36/941.40
  6. Step 6: Final answer
    x = 890.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.