Home / 15,513.12-21,407.76-8,439.39

Finding the Fourth Proportional to 15,513.12, 21,407.76 and 8,439.39

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Solution

The fourth proportional to 15,513.12, 21,407.76 and 8,439.39 is: 11,646.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,513.12 : 21,407.76 = 8,439.39 : x
  2. Step 2: Convert to fraction form
    15,513.12/21,407.76 = 8,439.39/x
  3. Step 3: Cross multiply
    15,513.12x = 21,407.76 × 8,439.39
  4. Step 4: Simplify right side
    15,513.12x = 180,668,435.67
  5. Step 5: Solve for x
    x = 180,668,435.67/15,513.12
  6. Step 6: Final answer
    x = 11,646.17

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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.