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Finding the Fourth Proportional to 841.34, 1,261.65 and 278.31

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Solution

The fourth proportional to 841.34, 1,261.65 and 278.31 is: 417.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.34 : 1,261.65 = 278.31 : x
  2. Step 2: Convert to fraction form
    841.34/1,261.65 = 278.31/x
  3. Step 3: Cross multiply
    841.34x = 1,261.65 × 278.31
  4. Step 4: Simplify right side
    841.34x = 351,133.50
  5. Step 5: Solve for x
    x = 351,133.50/841.34
  6. Step 6: Final answer
    x = 417.35

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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.