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Finding the Fourth Proportional to 1,572.34, 2,169.78 and 909.22

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Solution

The fourth proportional to 1,572.34, 2,169.78 and 909.22 is: 1,254.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.34 : 2,169.78 = 909.22 : x
  2. Step 2: Convert to fraction form
    1,572.34/2,169.78 = 909.22/x
  3. Step 3: Cross multiply
    1,572.34x = 2,169.78 × 909.22
  4. Step 4: Simplify right side
    1,572.34x = 1,972,807.37
  5. Step 5: Solve for x
    x = 1,972,807.37/1,572.34
  6. Step 6: Final answer
    x = 1,254.70

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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.