Home / 15,521.81-21,420.18-8,448.21

Finding the Fourth Proportional to 15,521.81, 21,420.18 and 8,448.21

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Solution

The fourth proportional to 15,521.81, 21,420.18 and 8,448.21 is: 11,658.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,521.81 : 21,420.18 = 8,448.21 : x
  2. Step 2: Convert to fraction form
    15,521.81/21,420.18 = 8,448.21/x
  3. Step 3: Cross multiply
    15,521.81x = 21,420.18 × 8,448.21
  4. Step 4: Simplify right side
    15,521.81x = 180,962,178.88
  5. Step 5: Solve for x
    x = 180,962,178.88/15,521.81
  6. Step 6: Final answer
    x = 11,658.58

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Double scale
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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.