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Finding the Fourth Proportional to 934.40, 1,401.60 and 642.80

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Solution

The fourth proportional to 934.40, 1,401.60 and 642.80 is: 964.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.40 : 1,401.60 = 642.80 : x
  2. Step 2: Convert to fraction form
    934.40/1,401.60 = 642.80/x
  3. Step 3: Cross multiply
    934.40x = 1,401.60 × 642.80
  4. Step 4: Simplify right side
    934.40x = 900,948.48
  5. Step 5: Solve for x
    x = 900,948.48/934.40
  6. Step 6: Final answer
    x = 964.20

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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.