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Finding the Fourth Proportional to 972.44, 1,342.02 and 623.72

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Solution

The fourth proportional to 972.44, 1,342.02 and 623.72 is: 860.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.44 : 1,342.02 = 623.72 : x
  2. Step 2: Convert to fraction form
    972.44/1,342.02 = 623.72/x
  3. Step 3: Cross multiply
    972.44x = 1,342.02 × 623.72
  4. Step 4: Simplify right side
    972.44x = 837,044.71
  5. Step 5: Solve for x
    x = 837,044.71/972.44
  6. Step 6: Final answer
    x = 860.77

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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.