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Finding the Fourth Proportional to 910.37, 1,365.94 and 390.48

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Solution

The fourth proportional to 910.37, 1,365.94 and 390.48 is: 585.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.37 : 1,365.94 = 390.48 : x
  2. Step 2: Convert to fraction form
    910.37/1,365.94 = 390.48/x
  3. Step 3: Cross multiply
    910.37x = 1,365.94 × 390.48
  4. Step 4: Simplify right side
    910.37x = 533,372.25
  5. Step 5: Solve for x
    x = 533,372.25/910.37
  6. Step 6: Final answer
    x = 585.89

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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.