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Finding the Fourth Proportional to 902.76, 1,355.10 and 390.12

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Solution

The fourth proportional to 902.76, 1,355.10 and 390.12 is: 585.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.76 : 1,355.10 = 390.12 : x
  2. Step 2: Convert to fraction form
    902.76/1,355.10 = 390.12/x
  3. Step 3: Cross multiply
    902.76x = 1,355.10 × 390.12
  4. Step 4: Simplify right side
    902.76x = 528,651.61
  5. Step 5: Solve for x
    x = 528,651.61/902.76
  6. Step 6: Final answer
    x = 585.59

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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.