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Finding the Fourth Proportional to 1,572.69, 2,170.32 and 909.54

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Solution

The fourth proportional to 1,572.69, 2,170.32 and 909.54 is: 1,255.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.69 : 2,170.32 = 909.54 : x
  2. Step 2: Convert to fraction form
    1,572.69/2,170.32 = 909.54/x
  3. Step 3: Cross multiply
    1,572.69x = 2,170.32 × 909.54
  4. Step 4: Simplify right side
    1,572.69x = 1,973,992.85
  5. Step 5: Solve for x
    x = 1,973,992.85/1,572.69
  6. Step 6: Final answer
    x = 1,255.17

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Double scale
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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.