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Finding the Fourth Proportional to 1,020.61, 1,409.73 and 887.57

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Solution

The fourth proportional to 1,020.61, 1,409.73 and 887.57 is: 1,225.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.61 : 1,409.73 = 887.57 : x
  2. Step 2: Convert to fraction form
    1,020.61/1,409.73 = 887.57/x
  3. Step 3: Cross multiply
    1,020.61x = 1,409.73 × 887.57
  4. Step 4: Simplify right side
    1,020.61x = 1,251,227.01
  5. Step 5: Solve for x
    x = 1,251,227.01/1,020.61
  6. Step 6: Final answer
    x = 1,225.96

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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.