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Finding the Fourth Proportional to 1,239.32, 1,709.34 and 909.08

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Solution

The fourth proportional to 1,239.32, 1,709.34 and 909.08 is: 1,253.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.32 : 1,709.34 = 909.08 : x
  2. Step 2: Convert to fraction form
    1,239.32/1,709.34 = 909.08/x
  3. Step 3: Cross multiply
    1,239.32x = 1,709.34 × 909.08
  4. Step 4: Simplify right side
    1,239.32x = 1,553,926.81
  5. Step 5: Solve for x
    x = 1,553,926.81/1,239.32
  6. Step 6: Final answer
    x = 1,253.85

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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.