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Finding the Fourth Proportional to 1,006.36, 1,384.90 and 977.81

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Solution

The fourth proportional to 1,006.36, 1,384.90 and 977.81 is: 1,345.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.36 : 1,384.90 = 977.81 : x
  2. Step 2: Convert to fraction form
    1,006.36/1,384.90 = 977.81/x
  3. Step 3: Cross multiply
    1,006.36x = 1,384.90 × 977.81
  4. Step 4: Simplify right side
    1,006.36x = 1,354,159.70
  5. Step 5: Solve for x
    x = 1,354,159.70/1,006.36
  6. Step 6: Final answer
    x = 1,345.61

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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.