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Finding the Fourth Proportional to 1,152.29, 1,589.56 and 779.40

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Solution

The fourth proportional to 1,152.29, 1,589.56 and 779.40 is: 1,075.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,152.29 : 1,589.56 = 779.40 : x
  2. Step 2: Convert to fraction form
    1,152.29/1,589.56 = 779.40/x
  3. Step 3: Cross multiply
    1,152.29x = 1,589.56 × 779.40
  4. Step 4: Simplify right side
    1,152.29x = 1,238,898.14
  5. Step 5: Solve for x
    x = 1,238,898.14/1,152.29
  6. Step 6: Final answer
    x = 1,075.16

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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.