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Finding the Fourth Proportional to 1,878.69, 2,817.21 and 723.63

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Solution

The fourth proportional to 1,878.69, 2,817.21 and 723.63 is: 1,085.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,878.69 : 2,817.21 = 723.63 : x
  2. Step 2: Convert to fraction form
    1,878.69/2,817.21 = 723.63/x
  3. Step 3: Cross multiply
    1,878.69x = 2,817.21 × 723.63
  4. Step 4: Simplify right side
    1,878.69x = 2,038,617.67
  5. Step 5: Solve for x
    x = 2,038,617.67/1,878.69
  6. Step 6: Final answer
    x = 1,085.13

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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.