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Finding the Fourth Proportional to 1,573.80, 2,171.85 and 875.18

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Solution

The fourth proportional to 1,573.80, 2,171.85 and 875.18 is: 1,207.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,573.80 : 2,171.85 = 875.18 : x
  2. Step 2: Convert to fraction form
    1,573.80/2,171.85 = 875.18/x
  3. Step 3: Cross multiply
    1,573.80x = 2,171.85 × 875.18
  4. Step 4: Simplify right side
    1,573.80x = 1,900,763.11
  5. Step 5: Solve for x
    x = 1,900,763.11/1,573.80
  6. Step 6: Final answer
    x = 1,207.75

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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.