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Finding the Fourth Proportional to 1,031.54, 1,539.74 and 908.48

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Solution

The fourth proportional to 1,031.54, 1,539.74 and 908.48 is: 1,356.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.54 : 1,539.74 = 908.48 : x
  2. Step 2: Convert to fraction form
    1,031.54/1,539.74 = 908.48/x
  3. Step 3: Cross multiply
    1,031.54x = 1,539.74 × 908.48
  4. Step 4: Simplify right side
    1,031.54x = 1,398,829.12
  5. Step 5: Solve for x
    x = 1,398,829.12/1,031.54
  6. Step 6: Final answer
    x = 1,356.07

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.