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Finding the Fourth Proportional to 1,369.08, 1,888.88 and 779.40

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Solution

The fourth proportional to 1,369.08, 1,888.88 and 779.40 is: 1,075.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.08 : 1,888.88 = 779.40 : x
  2. Step 2: Convert to fraction form
    1,369.08/1,888.88 = 779.40/x
  3. Step 3: Cross multiply
    1,369.08x = 1,888.88 × 779.40
  4. Step 4: Simplify right side
    1,369.08x = 1,472,193.07
  5. Step 5: Solve for x
    x = 1,472,193.07/1,369.08
  6. Step 6: Final answer
    x = 1,075.32

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1.5x scale

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.