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Finding the Fourth Proportional to 1,400.63, 1,932.87 and 779.63

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Solution

The fourth proportional to 1,400.63, 1,932.87 and 779.63 is: 1,075.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.63 : 1,932.87 = 779.63 : x
  2. Step 2: Convert to fraction form
    1,400.63/1,932.87 = 779.63/x
  3. Step 3: Cross multiply
    1,400.63x = 1,932.87 × 779.63
  4. Step 4: Simplify right side
    1,400.63x = 1,506,913.77
  5. Step 5: Solve for x
    x = 1,506,913.77/1,400.63
  6. Step 6: Final answer
    x = 1,075.89

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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.