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Finding the Fourth Proportional to 1,572.81, 2,170.42 and 909.78

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Solution

The fourth proportional to 1,572.81, 2,170.42 and 909.78 is: 1,255.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.81 : 2,170.42 = 909.78 : x
  2. Step 2: Convert to fraction form
    1,572.81/2,170.42 = 909.78/x
  3. Step 3: Cross multiply
    1,572.81x = 2,170.42 × 909.78
  4. Step 4: Simplify right side
    1,572.81x = 1,974,604.71
  5. Step 5: Solve for x
    x = 1,974,604.71/1,572.81
  6. Step 6: Final answer
    x = 1,255.46

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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.