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Finding the Fourth Proportional to 1,138.19, 1,707.55 and 358.22

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Solution

The fourth proportional to 1,138.19, 1,707.55 and 358.22 is: 537.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.19 : 1,707.55 = 358.22 : x
  2. Step 2: Convert to fraction form
    1,138.19/1,707.55 = 358.22/x
  3. Step 3: Cross multiply
    1,138.19x = 1,707.55 × 358.22
  4. Step 4: Simplify right side
    1,138.19x = 611,681.93
  5. Step 5: Solve for x
    x = 611,681.93/1,138.19
  6. Step 6: Final answer
    x = 537.42

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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.