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Finding the Fourth Proportional to 972.36, 1,342.85 and 623.25

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Solution

The fourth proportional to 972.36, 1,342.85 and 623.25 is: 860.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.36 : 1,342.85 = 623.25 : x
  2. Step 2: Convert to fraction form
    972.36/1,342.85 = 623.25/x
  3. Step 3: Cross multiply
    972.36x = 1,342.85 × 623.25
  4. Step 4: Simplify right side
    972.36x = 836,928.15
  5. Step 5: Solve for x
    x = 836,928.15/972.36
  6. Step 6: Final answer
    x = 860.72

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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.