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Finding the Fourth Proportional to 870.73, 1,201.10 and 621.50

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Solution

The fourth proportional to 870.73, 1,201.10 and 621.50 is: 857.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.73 : 1,201.10 = 621.50 : x
  2. Step 2: Convert to fraction form
    870.73/1,201.10 = 621.50/x
  3. Step 3: Cross multiply
    870.73x = 1,201.10 × 621.50
  4. Step 4: Simplify right side
    870.73x = 746,474.54
  5. Step 5: Solve for x
    x = 746,474.54/870.73
  6. Step 6: Final answer
    x = 857.30

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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.