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Finding the Fourth Proportional to 1,145.71, 1,580.99 and 667.12

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Solution

The fourth proportional to 1,145.71, 1,580.99 and 667.12 is: 920.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.71 : 1,580.99 = 667.12 : x
  2. Step 2: Convert to fraction form
    1,145.71/1,580.99 = 667.12/x
  3. Step 3: Cross multiply
    1,145.71x = 1,580.99 × 667.12
  4. Step 4: Simplify right side
    1,145.71x = 1,054,707.76
  5. Step 5: Solve for x
    x = 1,054,707.76/1,145.71
  6. Step 6: Final answer
    x = 920.57

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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.