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Finding the Fourth Proportional to 977.02, 1,347.08 and 827.40

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Solution

The fourth proportional to 977.02, 1,347.08 and 827.40 is: 1,140.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.02 : 1,347.08 = 827.40 : x
  2. Step 2: Convert to fraction form
    977.02/1,347.08 = 827.40/x
  3. Step 3: Cross multiply
    977.02x = 1,347.08 × 827.40
  4. Step 4: Simplify right side
    977.02x = 1,114,573.99
  5. Step 5: Solve for x
    x = 1,114,573.99/977.02
  6. Step 6: Final answer
    x = 1,140.79

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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.