Home / 15,455.40-21,328.47-8,381.76

Finding the Fourth Proportional to 15,455.40, 21,328.47 and 8,381.76

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Solution

The fourth proportional to 15,455.40, 21,328.47 and 8,381.76 is: 11,566.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,455.40 : 21,328.47 = 8,381.76 : x
  2. Step 2: Convert to fraction form
    15,455.40/21,328.47 = 8,381.76/x
  3. Step 3: Cross multiply
    15,455.40x = 21,328.47 × 8,381.76
  4. Step 4: Simplify right side
    15,455.40x = 178,770,116.71
  5. Step 5: Solve for x
    x = 178,770,116.71/15,455.40
  6. Step 6: Final answer
    x = 11,566.84

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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.