Home / 1,575.60-2,175.10-1,220.72

Finding the Fourth Proportional to 1,575.60, 2,175.10 and 1,220.72

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Solution

The fourth proportional to 1,575.60, 2,175.10 and 1,220.72 is: 1,685.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,575.60 : 2,175.10 = 1,220.72 : x
  2. Step 2: Convert to fraction form
    1,575.60/2,175.10 = 1,220.72/x
  3. Step 3: Cross multiply
    1,575.60x = 2,175.10 × 1,220.72
  4. Step 4: Simplify right side
    1,575.60x = 2,655,188.07
  5. Step 5: Solve for x
    x = 2,655,188.07/1,575.60
  6. Step 6: Final answer
    x = 1,685.19

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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.