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Finding the Fourth Proportional to 870.94, 1,304.38 and 623.49

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Solution

The fourth proportional to 870.94, 1,304.38 and 623.49 is: 933.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    870.94 : 1,304.38 = 623.49 : x
  2. Step 2: Convert to fraction form
    870.94/1,304.38 = 623.49/x
  3. Step 3: Cross multiply
    870.94x = 1,304.38 × 623.49
  4. Step 4: Simplify right side
    870.94x = 813,267.89
  5. Step 5: Solve for x
    x = 813,267.89/870.94
  6. Step 6: Final answer
    x = 933.78

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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.