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Finding the Fourth Proportional to 1,153.05, 1,590.70 and 779.89

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Solution

The fourth proportional to 1,153.05, 1,590.70 and 779.89 is: 1,075.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,153.05 : 1,590.70 = 779.89 : x
  2. Step 2: Convert to fraction form
    1,153.05/1,590.70 = 779.89/x
  3. Step 3: Cross multiply
    1,153.05x = 1,590.70 × 779.89
  4. Step 4: Simplify right side
    1,153.05x = 1,240,571.02
  5. Step 5: Solve for x
    x = 1,240,571.02/1,153.05
  6. Step 6: Final answer
    x = 1,075.90

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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.