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Finding the Fourth Proportional to 1,007.05, 1,389.03 and 708.92

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Solution

The fourth proportional to 1,007.05, 1,389.03 and 708.92 is: 977.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.05 : 1,389.03 = 708.92 : x
  2. Step 2: Convert to fraction form
    1,007.05/1,389.03 = 708.92/x
  3. Step 3: Cross multiply
    1,007.05x = 1,389.03 × 708.92
  4. Step 4: Simplify right side
    1,007.05x = 984,709.41
  5. Step 5: Solve for x
    x = 984,709.41/1,007.05
  6. Step 6: Final answer
    x = 977.81

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1.5x scale

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.