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Finding the Fourth Proportional to 1,239.21, 1,710.99 and 908.10

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Solution

The fourth proportional to 1,239.21, 1,710.99 and 908.10 is: 1,253.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.21 : 1,710.99 = 908.10 : x
  2. Step 2: Convert to fraction form
    1,239.21/1,710.99 = 908.10/x
  3. Step 3: Cross multiply
    1,239.21x = 1,710.99 × 908.10
  4. Step 4: Simplify right side
    1,239.21x = 1,553,750.02
  5. Step 5: Solve for x
    x = 1,553,750.02/1,239.21
  6. Step 6: Final answer
    x = 1,253.82

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1.5x scale

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.