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Finding the Fourth Proportional to 1,421.75, 1,962.11 and 824.35

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Solution

The fourth proportional to 1,421.75, 1,962.11 and 824.35 is: 1,137.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.75 : 1,962.11 = 824.35 : x
  2. Step 2: Convert to fraction form
    1,421.75/1,962.11 = 824.35/x
  3. Step 3: Cross multiply
    1,421.75x = 1,962.11 × 824.35
  4. Step 4: Simplify right side
    1,421.75x = 1,617,465.38
  5. Step 5: Solve for x
    x = 1,617,465.38/1,421.75
  6. Step 6: Final answer
    x = 1,137.66

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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.