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Finding the Fourth Proportional to 897.92, 1,347.09 and 312.83

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Solution

The fourth proportional to 897.92, 1,347.09 and 312.83 is: 469.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.92 : 1,347.09 = 312.83 : x
  2. Step 2: Convert to fraction form
    897.92/1,347.09 = 312.83/x
  3. Step 3: Cross multiply
    897.92x = 1,347.09 × 312.83
  4. Step 4: Simplify right side
    897.92x = 421,413.53
  5. Step 5: Solve for x
    x = 421,413.53/897.92
  6. Step 6: Final answer
    x = 469.32

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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.