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Finding the Fourth Proportional to 912.78, 1,362.78 and 766.98

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Solution

The fourth proportional to 912.78, 1,362.78 and 766.98 is: 1,145.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.78 : 1,362.78 = 766.98 : x
  2. Step 2: Convert to fraction form
    912.78/1,362.78 = 766.98/x
  3. Step 3: Cross multiply
    912.78x = 1,362.78 × 766.98
  4. Step 4: Simplify right side
    912.78x = 1,045,225.00
  5. Step 5: Solve for x
    x = 1,045,225.00/912.78
  6. Step 6: Final answer
    x = 1,145.10

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.