Home / 15,613.79-21,547.54-8,540.21

Finding the Fourth Proportional to 15,613.79, 21,547.54 and 8,540.21

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Solution

The fourth proportional to 15,613.79, 21,547.54 and 8,540.21 is: 11,785.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,613.79 : 21,547.54 = 8,540.21 : x
  2. Step 2: Convert to fraction form
    15,613.79/21,547.54 = 8,540.21/x
  3. Step 3: Cross multiply
    15,613.79x = 21,547.54 × 8,540.21
  4. Step 4: Simplify right side
    15,613.79x = 184,020,408.85
  5. Step 5: Solve for x
    x = 184,020,408.85/15,613.79
  6. Step 6: Final answer
    x = 11,785.77

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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.