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Finding the Fourth Proportional to 1,307.77, 1,961.72 and 442.09

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Solution

The fourth proportional to 1,307.77, 1,961.72 and 442.09 is: 663.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.77 : 1,961.72 = 442.09 : x
  2. Step 2: Convert to fraction form
    1,307.77/1,961.72 = 442.09/x
  3. Step 3: Cross multiply
    1,307.77x = 1,961.72 × 442.09
  4. Step 4: Simplify right side
    1,307.77x = 867,256.79
  5. Step 5: Solve for x
    x = 867,256.79/1,307.77
  6. Step 6: Final answer
    x = 663.16

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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.