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Finding the Fourth Proportional to 1,075.30, 1,613.97 and 612.99

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Solution

The fourth proportional to 1,075.30, 1,613.97 and 612.99 is: 920.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,075.30 : 1,613.97 = 612.99 : x
  2. Step 2: Convert to fraction form
    1,075.30/1,613.97 = 612.99/x
  3. Step 3: Cross multiply
    1,075.30x = 1,613.97 × 612.99
  4. Step 4: Simplify right side
    1,075.30x = 989,347.47
  5. Step 5: Solve for x
    x = 989,347.47/1,075.30
  6. Step 6: Final answer
    x = 920.07

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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.