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Finding the Fourth Proportional to 1,138.08, 1,707.28 and 407.52

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Solution

The fourth proportional to 1,138.08, 1,707.28 and 407.52 is: 611.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.08 : 1,707.28 = 407.52 : x
  2. Step 2: Convert to fraction form
    1,138.08/1,707.28 = 407.52/x
  3. Step 3: Cross multiply
    1,138.08x = 1,707.28 × 407.52
  4. Step 4: Simplify right side
    1,138.08x = 695,750.75
  5. Step 5: Solve for x
    x = 695,750.75/1,138.08
  6. Step 6: Final answer
    x = 611.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.