Home / 18,810.72-28,216.80-7,718.40

Finding the Fourth Proportional to 18,810.72, 28,216.80 and 7,718.40

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Solution

The fourth proportional to 18,810.72, 28,216.80 and 7,718.40 is: 11,577.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,810.72 : 28,216.80 = 7,718.40 : x
  2. Step 2: Convert to fraction form
    18,810.72/28,216.80 = 7,718.40/x
  3. Step 3: Cross multiply
    18,810.72x = 28,216.80 × 7,718.40
  4. Step 4: Simplify right side
    18,810.72x = 217,788,549.12
  5. Step 5: Solve for x
    x = 217,788,549.12/18,810.72
  6. Step 6: Final answer
    x = 11,577.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.