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Finding the Fourth Proportional to 977.85, 1,348.69 and 623.88

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Solution

The fourth proportional to 977.85, 1,348.69 and 623.88 is: 860.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.85 : 1,348.69 = 623.88 : x
  2. Step 2: Convert to fraction form
    977.85/1,348.69 = 623.88/x
  3. Step 3: Cross multiply
    977.85x = 1,348.69 × 623.88
  4. Step 4: Simplify right side
    977.85x = 841,420.72
  5. Step 5: Solve for x
    x = 841,420.72/977.85
  6. Step 6: Final answer
    x = 860.48

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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.