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Finding the Fourth Proportional to 1,868.78, 2,802.91 and 772.99

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Solution

The fourth proportional to 1,868.78, 2,802.91 and 772.99 is: 1,159.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,868.78 : 2,802.91 = 772.99 : x
  2. Step 2: Convert to fraction form
    1,868.78/2,802.91 = 772.99/x
  3. Step 3: Cross multiply
    1,868.78x = 2,802.91 × 772.99
  4. Step 4: Simplify right side
    1,868.78x = 2,166,621.40
  5. Step 5: Solve for x
    x = 2,166,621.40/1,868.78
  6. Step 6: Final answer
    x = 1,159.38

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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.