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Finding the Fourth Proportional to 1,572.45, 2,169.77 and 909.20

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Solution

The fourth proportional to 1,572.45, 2,169.77 and 909.20 is: 1,254.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.45 : 2,169.77 = 909.20 : x
  2. Step 2: Convert to fraction form
    1,572.45/2,169.77 = 909.20/x
  3. Step 3: Cross multiply
    1,572.45x = 2,169.77 × 909.20
  4. Step 4: Simplify right side
    1,572.45x = 1,972,739.49
  5. Step 5: Solve for x
    x = 1,972,739.49/1,572.45
  6. Step 6: Final answer
    x = 1,254.56

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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.