Home / 15,420.89-21,280.84-8,347.29

Finding the Fourth Proportional to 15,420.89, 21,280.84 and 8,347.29

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Solution

The fourth proportional to 15,420.89, 21,280.84 and 8,347.29 is: 11,519.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420.89 : 21,280.84 = 8,347.29 : x
  2. Step 2: Convert to fraction form
    15,420.89/21,280.84 = 8,347.29/x
  3. Step 3: Cross multiply
    15,420.89x = 21,280.84 × 8,347.29
  4. Step 4: Simplify right side
    15,420.89x = 177,637,342.92
  5. Step 5: Solve for x
    x = 177,637,342.92/15,420.89
  6. Step 6: Final answer
    x = 11,519.27

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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.