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Finding the Fourth Proportional to 489.02, 732.58 and 386.15

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Solution

The fourth proportional to 489.02, 732.58 and 386.15 is: 578.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.02 : 732.58 = 386.15 : x
  2. Step 2: Convert to fraction form
    489.02/732.58 = 386.15/x
  3. Step 3: Cross multiply
    489.02x = 732.58 × 386.15
  4. Step 4: Simplify right side
    489.02x = 282,881.14
  5. Step 5: Solve for x
    x = 282,881.14/489.02
  6. Step 6: Final answer
    x = 578.47

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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.