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Finding the Fourth Proportional to 1,109.34, 1,530.41 and 666.99

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Solution

The fourth proportional to 1,109.34, 1,530.41 and 666.99 is: 920.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.34 : 1,530.41 = 666.99 : x
  2. Step 2: Convert to fraction form
    1,109.34/1,530.41 = 666.99/x
  3. Step 3: Cross multiply
    1,109.34x = 1,530.41 × 666.99
  4. Step 4: Simplify right side
    1,109.34x = 1,020,761.00
  5. Step 5: Solve for x
    x = 1,020,761.00/1,109.34
  6. Step 6: Final answer
    x = 920.15

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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.