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Finding the Fourth Proportional to 1,007.08, 1,389.77 and 564.98

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Solution

The fourth proportional to 1,007.08, 1,389.77 and 564.98 is: 779.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.08 : 1,389.77 = 564.98 : x
  2. Step 2: Convert to fraction form
    1,007.08/1,389.77 = 564.98/x
  3. Step 3: Cross multiply
    1,007.08x = 1,389.77 × 564.98
  4. Step 4: Simplify right side
    1,007.08x = 785,192.25
  5. Step 5: Solve for x
    x = 785,192.25/1,007.08
  6. Step 6: Final answer
    x = 779.67

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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.