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Finding the Fourth Proportional to 897.48, 1,338.69 and 858.60

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Solution

The fourth proportional to 897.48, 1,338.69 and 858.60 is: 1,280.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.48 : 1,338.69 = 858.60 : x
  2. Step 2: Convert to fraction form
    897.48/1,338.69 = 858.60/x
  3. Step 3: Cross multiply
    897.48x = 1,338.69 × 858.60
  4. Step 4: Simplify right side
    897.48x = 1,149,399.23
  5. Step 5: Solve for x
    x = 1,149,399.23/897.48
  6. Step 6: Final answer
    x = 1,280.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.