Home / 1,587.21-2,190.35-879.10

Finding the Fourth Proportional to 1,587.21, 2,190.35 and 879.10

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Solution

The fourth proportional to 1,587.21, 2,190.35 and 879.10 is: 1,213.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.21 : 2,190.35 = 879.10 : x
  2. Step 2: Convert to fraction form
    1,587.21/2,190.35 = 879.10/x
  3. Step 3: Cross multiply
    1,587.21x = 2,190.35 × 879.10
  4. Step 4: Simplify right side
    1,587.21x = 1,925,536.69
  5. Step 5: Solve for x
    x = 1,925,536.69/1,587.21
  6. Step 6: Final answer
    x = 1,213.16

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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.