Home / 1,521.17-2,099.29-891.69

Finding the Fourth Proportional to 1,521.17, 2,099.29 and 891.69

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Solution

The fourth proportional to 1,521.17, 2,099.29 and 891.69 is: 1,230.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.17 : 2,099.29 = 891.69 : x
  2. Step 2: Convert to fraction form
    1,521.17/2,099.29 = 891.69/x
  3. Step 3: Cross multiply
    1,521.17x = 2,099.29 × 891.69
  4. Step 4: Simplify right side
    1,521.17x = 1,871,915.90
  5. Step 5: Solve for x
    x = 1,871,915.90/1,521.17
  6. Step 6: Final answer
    x = 1,230.58

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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.