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Finding the Fourth Proportional to 870.03, 1,201.01 and 621.45

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Solution

The fourth proportional to 870.03, 1,201.01 and 621.45 is: 857.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.03 : 1,201.01 = 621.45 : x
  2. Step 2: Convert to fraction form
    870.03/1,201.01 = 621.45/x
  3. Step 3: Cross multiply
    870.03x = 1,201.01 × 621.45
  4. Step 4: Simplify right side
    870.03x = 746,364.56
  5. Step 5: Solve for x
    x = 746,364.56/870.03
  6. Step 6: Final answer
    x = 857.86

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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.