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Finding the Fourth Proportional to 897.84, 1,345.90 and 281.12

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Solution

The fourth proportional to 897.84, 1,345.90 and 281.12 is: 421.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.84 : 1,345.90 = 281.12 : x
  2. Step 2: Convert to fraction form
    897.84/1,345.90 = 281.12/x
  3. Step 3: Cross multiply
    897.84x = 1,345.90 × 281.12
  4. Step 4: Simplify right side
    897.84x = 378,356.02
  5. Step 5: Solve for x
    x = 378,356.02/897.84
  6. Step 6: Final answer
    x = 421.40

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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.