Home / 20,130.30-27,783.75-12,857.72

Finding the Fourth Proportional to 20,130.30, 27,783.75 and 12,857.72

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Solution

The fourth proportional to 20,130.30, 27,783.75 and 12,857.72 is: 17,746.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,130.30 : 27,783.75 = 12,857.72 : x
  2. Step 2: Convert to fraction form
    20,130.30/27,783.75 = 12,857.72/x
  3. Step 3: Cross multiply
    20,130.30x = 27,783.75 × 12,857.72
  4. Step 4: Simplify right side
    20,130.30x = 357,235,539.13
  5. Step 5: Solve for x
    x = 357,235,539.13/20,130.30
  6. Step 6: Final answer
    x = 17,746.16

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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.