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Finding the Fourth Proportional to 489.36, 732.66 and 390.93

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Solution

The fourth proportional to 489.36, 732.66 and 390.93 is: 585.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.36 : 732.66 = 390.93 : x
  2. Step 2: Convert to fraction form
    489.36/732.66 = 390.93/x
  3. Step 3: Cross multiply
    489.36x = 732.66 × 390.93
  4. Step 4: Simplify right side
    489.36x = 286,418.77
  5. Step 5: Solve for x
    x = 286,418.77/489.36
  6. Step 6: Final answer
    x = 585.29

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.