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Finding the Fourth Proportional to 772.36, 1,065.87 and 492.35

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Solution

The fourth proportional to 772.36, 1,065.87 and 492.35 is: 679.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.36 : 1,065.87 = 492.35 : x
  2. Step 2: Convert to fraction form
    772.36/1,065.87 = 492.35/x
  3. Step 3: Cross multiply
    772.36x = 1,065.87 × 492.35
  4. Step 4: Simplify right side
    772.36x = 524,775.77
  5. Step 5: Solve for x
    x = 524,775.77/772.36
  6. Step 6: Final answer
    x = 679.45

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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.