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Finding the Fourth Proportional to 779.18, 1,168.72 and 316.40

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Solution

The fourth proportional to 779.18, 1,168.72 and 316.40 is: 474.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.18 : 1,168.72 = 316.40 : x
  2. Step 2: Convert to fraction form
    779.18/1,168.72 = 316.40/x
  3. Step 3: Cross multiply
    779.18x = 1,168.72 × 316.40
  4. Step 4: Simplify right side
    779.18x = 369,783.01
  5. Step 5: Solve for x
    x = 369,783.01/779.18
  6. Step 6: Final answer
    x = 474.58

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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.