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Finding the Fourth Proportional to 1,310.61, 1,808.69 and 751.19

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Solution

The fourth proportional to 1,310.61, 1,808.69 and 751.19 is: 1,036.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,310.61 : 1,808.69 = 751.19 : x
  2. Step 2: Convert to fraction form
    1,310.61/1,808.69 = 751.19/x
  3. Step 3: Cross multiply
    1,310.61x = 1,808.69 × 751.19
  4. Step 4: Simplify right side
    1,310.61x = 1,358,665.61
  5. Step 5: Solve for x
    x = 1,358,665.61/1,310.61
  6. Step 6: Final answer
    x = 1,036.67

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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.