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Finding the Fourth Proportional to 977.72, 1,348.84 and 623.55

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Solution

The fourth proportional to 977.72, 1,348.84 and 623.55 is: 860.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.72 : 1,348.84 = 623.55 : x
  2. Step 2: Convert to fraction form
    977.72/1,348.84 = 623.55/x
  3. Step 3: Cross multiply
    977.72x = 1,348.84 × 623.55
  4. Step 4: Simplify right side
    977.72x = 841,067.62
  5. Step 5: Solve for x
    x = 841,067.62/977.72
  6. Step 6: Final answer
    x = 860.23

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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.