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Finding the Fourth Proportional to 948.21, 1,420.42 and 753.54

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Solution

The fourth proportional to 948.21, 1,420.42 and 753.54 is: 1,128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.21 : 1,420.42 = 753.54 : x
  2. Step 2: Convert to fraction form
    948.21/1,420.42 = 753.54/x
  3. Step 3: Cross multiply
    948.21x = 1,420.42 × 753.54
  4. Step 4: Simplify right side
    948.21x = 1,070,343.29
  5. Step 5: Solve for x
    x = 1,070,343.29/948.21
  6. Step 6: Final answer
    x = 1,128.80

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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.