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Finding the Fourth Proportional to 897.80, 1,346.70 and 840.20

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Solution

The fourth proportional to 897.80, 1,346.70 and 840.20 is: 1,260.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.80 : 1,346.70 = 840.20 : x
  2. Step 2: Convert to fraction form
    897.80/1,346.70 = 840.20/x
  3. Step 3: Cross multiply
    897.80x = 1,346.70 × 840.20
  4. Step 4: Simplify right side
    897.80x = 1,131,497.34
  5. Step 5: Solve for x
    x = 1,131,497.34/897.80
  6. Step 6: Final answer
    x = 1,260.30

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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.