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Finding the Fourth Proportional to 1,572.47, 2,169.96 and 909.35

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Solution

The fourth proportional to 1,572.47, 2,169.96 and 909.35 is: 1,254.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.47 : 2,169.96 = 909.35 : x
  2. Step 2: Convert to fraction form
    1,572.47/2,169.96 = 909.35/x
  3. Step 3: Cross multiply
    1,572.47x = 2,169.96 × 909.35
  4. Step 4: Simplify right side
    1,572.47x = 1,973,253.13
  5. Step 5: Solve for x
    x = 1,973,253.13/1,572.47
  6. Step 6: Final answer
    x = 1,254.87

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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.