Home / 1,521.19-2,099.13-891.64

Finding the Fourth Proportional to 1,521.19, 2,099.13 and 891.64

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Solution

The fourth proportional to 1,521.19, 2,099.13 and 891.64 is: 1,230.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.19 : 2,099.13 = 891.64 : x
  2. Step 2: Convert to fraction form
    1,521.19/2,099.13 = 891.64/x
  3. Step 3: Cross multiply
    1,521.19x = 2,099.13 × 891.64
  4. Step 4: Simplify right side
    1,521.19x = 1,871,668.27
  5. Step 5: Solve for x
    x = 1,871,668.27/1,521.19
  6. Step 6: Final answer
    x = 1,230.40

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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.