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Finding the Fourth Proportional to 1,355.74, 2,031.19 and 623.77

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Solution

The fourth proportional to 1,355.74, 2,031.19 and 623.77 is: 934.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.74 : 2,031.19 = 623.77 : x
  2. Step 2: Convert to fraction form
    1,355.74/2,031.19 = 623.77/x
  3. Step 3: Cross multiply
    1,355.74x = 2,031.19 × 623.77
  4. Step 4: Simplify right side
    1,355.74x = 1,266,992.26
  5. Step 5: Solve for x
    x = 1,266,992.26/1,355.74
  6. Step 6: Final answer
    x = 934.54

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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.