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Finding the Fourth Proportional to 977.91, 1,349.14 and 623.77

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Solution

The fourth proportional to 977.91, 1,349.14 and 623.77 is: 860.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.91 : 1,349.14 = 623.77 : x
  2. Step 2: Convert to fraction form
    977.91/1,349.14 = 623.77/x
  3. Step 3: Cross multiply
    977.91x = 1,349.14 × 623.77
  4. Step 4: Simplify right side
    977.91x = 841,553.06
  5. Step 5: Solve for x
    x = 841,553.06/977.91
  6. Step 6: Final answer
    x = 860.56

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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.