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Finding the Fourth Proportional to 1,572.42, 2,170.08 and 909.29

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Solution

The fourth proportional to 1,572.42, 2,170.08 and 909.29 is: 1,254.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.42 : 2,170.08 = 909.29 : x
  2. Step 2: Convert to fraction form
    1,572.42/2,170.08 = 909.29/x
  3. Step 3: Cross multiply
    1,572.42x = 2,170.08 × 909.29
  4. Step 4: Simplify right side
    1,572.42x = 1,973,221.19
  5. Step 5: Solve for x
    x = 1,973,221.19/1,572.42
  6. Step 6: Final answer
    x = 1,254.89

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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.