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Finding the Fourth Proportional to 904.70, 1,357.05 and 280.01

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Solution

The fourth proportional to 904.70, 1,357.05 and 280.01 is: 420.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.70 : 1,357.05 = 280.01 : x
  2. Step 2: Convert to fraction form
    904.70/1,357.05 = 280.01/x
  3. Step 3: Cross multiply
    904.70x = 1,357.05 × 280.01
  4. Step 4: Simplify right side
    904.70x = 379,987.57
  5. Step 5: Solve for x
    x = 379,987.57/904.70
  6. Step 6: Final answer
    x = 420.02

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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.