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Finding the Fourth Proportional to 1,138, 1,570.50 and 672.40

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Solution

The fourth proportional to 1,138, 1,570.50 and 672.40 is: 927.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138 : 1,570.50 = 672.40 : x
  2. Step 2: Convert to fraction form
    1,138/1,570.50 = 672.40/x
  3. Step 3: Cross multiply
    1,138x = 1,570.50 × 672.40
  4. Step 4: Simplify right side
    1,138x = 1,056,004.20
  5. Step 5: Solve for x
    x = 1,056,004.20/1,138
  6. Step 6: Final answer
    x = 927.95

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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.