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Finding the Fourth Proportional to 903.69, 1,355.54 and 287.45

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Solution

The fourth proportional to 903.69, 1,355.54 and 287.45 is: 431.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.69 : 1,355.54 = 287.45 : x
  2. Step 2: Convert to fraction form
    903.69/1,355.54 = 287.45/x
  3. Step 3: Cross multiply
    903.69x = 1,355.54 × 287.45
  4. Step 4: Simplify right side
    903.69x = 389,646.84
  5. Step 5: Solve for x
    x = 389,646.84/903.69
  6. Step 6: Final answer
    x = 431.17

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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.