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Finding the Fourth Proportional to 904.04, 1,355.76 and 287.88

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Solution

The fourth proportional to 904.04, 1,355.76 and 287.88 is: 431.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.04 : 1,355.76 = 287.88 : x
  2. Step 2: Convert to fraction form
    904.04/1,355.76 = 287.88/x
  3. Step 3: Cross multiply
    904.04x = 1,355.76 × 287.88
  4. Step 4: Simplify right side
    904.04x = 390,296.19
  5. Step 5: Solve for x
    x = 390,296.19/904.04
  6. Step 6: Final answer
    x = 431.72

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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.