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Finding the Fourth Proportional to 841.40, 1,263.45 and 636.20

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Solution

The fourth proportional to 841.40, 1,263.45 and 636.20 is: 955.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.40 : 1,263.45 = 636.20 : x
  2. Step 2: Convert to fraction form
    841.40/1,263.45 = 636.20/x
  3. Step 3: Cross multiply
    841.40x = 1,263.45 × 636.20
  4. Step 4: Simplify right side
    841.40x = 803,806.89
  5. Step 5: Solve for x
    x = 803,806.89/841.40
  6. Step 6: Final answer
    x = 955.32

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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.