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Finding the Fourth Proportional to 1,257.69, 1,886.86 and 641.39

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Solution

The fourth proportional to 1,257.69, 1,886.86 and 641.39 is: 962.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.69 : 1,886.86 = 641.39 : x
  2. Step 2: Convert to fraction form
    1,257.69/1,886.86 = 641.39/x
  3. Step 3: Cross multiply
    1,257.69x = 1,886.86 × 641.39
  4. Step 4: Simplify right side
    1,257.69x = 1,210,204.50
  5. Step 5: Solve for x
    x = 1,210,204.50/1,257.69
  6. Step 6: Final answer
    x = 962.24

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1.5x scale

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.