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Finding the Fourth Proportional to 897.93, 1,239.66 and 648.99

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Solution

The fourth proportional to 897.93, 1,239.66 and 648.99 is: 895.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.93 : 1,239.66 = 648.99 : x
  2. Step 2: Convert to fraction form
    897.93/1,239.66 = 648.99/x
  3. Step 3: Cross multiply
    897.93x = 1,239.66 × 648.99
  4. Step 4: Simplify right side
    897.93x = 804,526.94
  5. Step 5: Solve for x
    x = 804,526.94/897.93
  6. Step 6: Final answer
    x = 895.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.