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Finding the Fourth Proportional to 1,357.80, 2,034.08 and 810.42

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Solution

The fourth proportional to 1,357.80, 2,034.08 and 810.42 is: 1,214.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.80 : 2,034.08 = 810.42 : x
  2. Step 2: Convert to fraction form
    1,357.80/2,034.08 = 810.42/x
  3. Step 3: Cross multiply
    1,357.80x = 2,034.08 × 810.42
  4. Step 4: Simplify right side
    1,357.80x = 1,648,459.11
  5. Step 5: Solve for x
    x = 1,648,459.11/1,357.80
  6. Step 6: Final answer
    x = 1,214.07

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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.