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Finding the Fourth Proportional to 904.86, 1,355.40 and 579.24

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Solution

The fourth proportional to 904.86, 1,355.40 and 579.24 is: 867.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.86 : 1,355.40 = 579.24 : x
  2. Step 2: Convert to fraction form
    904.86/1,355.40 = 579.24/x
  3. Step 3: Cross multiply
    904.86x = 1,355.40 × 579.24
  4. Step 4: Simplify right side
    904.86x = 785,101.90
  5. Step 5: Solve for x
    x = 785,101.90/904.86
  6. Step 6: Final answer
    x = 867.65

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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.