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Finding the Fourth Proportional to 489.65, 734.47 and 143.07

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Solution

The fourth proportional to 489.65, 734.47 and 143.07 is: 214.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.65 : 734.47 = 143.07 : x
  2. Step 2: Convert to fraction form
    489.65/734.47 = 143.07/x
  3. Step 3: Cross multiply
    489.65x = 734.47 × 143.07
  4. Step 4: Simplify right side
    489.65x = 105,077.51
  5. Step 5: Solve for x
    x = 105,077.51/489.65
  6. Step 6: Final answer
    x = 214.60

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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.