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Finding the Fourth Proportional to 1,284.04, 1,770.42 and 841.78

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Solution

The fourth proportional to 1,284.04, 1,770.42 and 841.78 is: 1,160.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,284.04 : 1,770.42 = 841.78 : x
  2. Step 2: Convert to fraction form
    1,284.04/1,770.42 = 841.78/x
  3. Step 3: Cross multiply
    1,284.04x = 1,770.42 × 841.78
  4. Step 4: Simplify right side
    1,284.04x = 1,490,304.15
  5. Step 5: Solve for x
    x = 1,490,304.15/1,284.04
  6. Step 6: Final answer
    x = 1,160.64

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1.5x scale

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.