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Finding the Fourth Proportional to 897.01, 1,345.07 and 280.78

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Solution

The fourth proportional to 897.01, 1,345.07 and 280.78 is: 421.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.01 : 1,345.07 = 280.78 : x
  2. Step 2: Convert to fraction form
    897.01/1,345.07 = 280.78/x
  3. Step 3: Cross multiply
    897.01x = 1,345.07 × 280.78
  4. Step 4: Simplify right side
    897.01x = 377,666.09
  5. Step 5: Solve for x
    x = 377,666.09/897.01
  6. Step 6: Final answer
    x = 421.03

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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.