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Finding the Fourth Proportional to 1,007, 1,389.97 and 565.05

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Solution

The fourth proportional to 1,007, 1,389.97 and 565.05 is: 779.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007 : 1,389.97 = 565.05 : x
  2. Step 2: Convert to fraction form
    1,007/1,389.97 = 565.05/x
  3. Step 3: Cross multiply
    1,007x = 1,389.97 × 565.05
  4. Step 4: Simplify right side
    1,007x = 785,402.55
  5. Step 5: Solve for x
    x = 785,402.55/1,007
  6. Step 6: Final answer
    x = 779.94

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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.