Home / 15,345.12-21,176.16-8,721.12

Finding the Fourth Proportional to 15,345.12, 21,176.16 and 8,721.12

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Solution

The fourth proportional to 15,345.12, 21,176.16 and 8,721.12 is: 12,035.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,345.12 : 21,176.16 = 8,721.12 : x
  2. Step 2: Convert to fraction form
    15,345.12/21,176.16 = 8,721.12/x
  3. Step 3: Cross multiply
    15,345.12x = 21,176.16 × 8,721.12
  4. Step 4: Simplify right side
    15,345.12x = 184,679,832.50
  5. Step 5: Solve for x
    x = 184,679,832.50/15,345.12
  6. Step 6: Final answer
    x = 12,035.09

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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.