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Finding the Fourth Proportional to 1,421.84, 1,962.33 and 1,071.92

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Solution

The fourth proportional to 1,421.84, 1,962.33 and 1,071.92 is: 1,479.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.84 : 1,962.33 = 1,071.92 : x
  2. Step 2: Convert to fraction form
    1,421.84/1,962.33 = 1,071.92/x
  3. Step 3: Cross multiply
    1,421.84x = 1,962.33 × 1,071.92
  4. Step 4: Simplify right side
    1,421.84x = 2,103,460.77
  5. Step 5: Solve for x
    x = 2,103,460.77/1,421.84
  6. Step 6: Final answer
    x = 1,479.39

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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.