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Finding the Fourth Proportional to 977.94, 1,356.89 and 969.57

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Solution

The fourth proportional to 977.94, 1,356.89 and 969.57 is: 1,345.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.94 : 1,356.89 = 969.57 : x
  2. Step 2: Convert to fraction form
    977.94/1,356.89 = 969.57/x
  3. Step 3: Cross multiply
    977.94x = 1,356.89 × 969.57
  4. Step 4: Simplify right side
    977.94x = 1,315,594.99
  5. Step 5: Solve for x
    x = 1,315,594.99/977.94
  6. Step 6: Final answer
    x = 1,345.27

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.