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Finding the Fourth Proportional to 779.23, 1,072.87 and 632.35

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Solution

The fourth proportional to 779.23, 1,072.87 and 632.35 is: 870.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.23 : 1,072.87 = 632.35 : x
  2. Step 2: Convert to fraction form
    779.23/1,072.87 = 632.35/x
  3. Step 3: Cross multiply
    779.23x = 1,072.87 × 632.35
  4. Step 4: Simplify right side
    779.23x = 678,429.34
  5. Step 5: Solve for x
    x = 678,429.34/779.23
  6. Step 6: Final answer
    x = 870.64

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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.