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Finding the Fourth Proportional to 1,572.68, 2,170.50 and 874.28

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Solution

The fourth proportional to 1,572.68, 2,170.50 and 874.28 is: 1,206.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,572.68 : 2,170.50 = 874.28 : x
  2. Step 2: Convert to fraction form
    1,572.68/2,170.50 = 874.28/x
  3. Step 3: Cross multiply
    1,572.68x = 2,170.50 × 874.28
  4. Step 4: Simplify right side
    1,572.68x = 1,897,624.74
  5. Step 5: Solve for x
    x = 1,897,624.74/1,572.68
  6. Step 6: Final answer
    x = 1,206.62

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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.