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Finding the Fourth Proportional to 2,075.65, 3,113.48 and 689.20

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Solution

The fourth proportional to 2,075.65, 3,113.48 and 689.20 is: 1,033.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,075.65 : 3,113.48 = 689.20 : x
  2. Step 2: Convert to fraction form
    2,075.65/3,113.48 = 689.20/x
  3. Step 3: Cross multiply
    2,075.65x = 3,113.48 × 689.20
  4. Step 4: Simplify right side
    2,075.65x = 2,145,810.42
  5. Step 5: Solve for x
    x = 2,145,810.42/2,075.65
  6. Step 6: Final answer
    x = 1,033.80

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1.5x scale

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.