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Finding the Fourth Proportional to 1,360.69, 1,877.64 and 771.21

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Solution

The fourth proportional to 1,360.69, 1,877.64 and 771.21 is: 1,064.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,360.69 : 1,877.64 = 771.21 : x
  2. Step 2: Convert to fraction form
    1,360.69/1,877.64 = 771.21/x
  3. Step 3: Cross multiply
    1,360.69x = 1,877.64 × 771.21
  4. Step 4: Simplify right side
    1,360.69x = 1,448,054.74
  5. Step 5: Solve for x
    x = 1,448,054.74/1,360.69
  6. Step 6: Final answer
    x = 1,064.21

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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.