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Finding the Fourth Proportional to 930.71, 1,290.54 and 899.57

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Solution

The fourth proportional to 930.71, 1,290.54 and 899.57 is: 1,247.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.71 : 1,290.54 = 899.57 : x
  2. Step 2: Convert to fraction form
    930.71/1,290.54 = 899.57/x
  3. Step 3: Cross multiply
    930.71x = 1,290.54 × 899.57
  4. Step 4: Simplify right side
    930.71x = 1,160,940.23
  5. Step 5: Solve for x
    x = 1,160,940.23/930.71
  6. Step 6: Final answer
    x = 1,247.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.