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Finding the Fourth Proportional to 1,312.07, 1,968.11 and 489.38

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Solution

The fourth proportional to 1,312.07, 1,968.11 and 489.38 is: 734.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.07 : 1,968.11 = 489.38 : x
  2. Step 2: Convert to fraction form
    1,312.07/1,968.11 = 489.38/x
  3. Step 3: Cross multiply
    1,312.07x = 1,968.11 × 489.38
  4. Step 4: Simplify right side
    1,312.07x = 963,141.38
  5. Step 5: Solve for x
    x = 963,141.38/1,312.07
  6. Step 6: Final answer
    x = 734.07

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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.