Home / 20,318.55-28,056.90-12,777.50

Finding the Fourth Proportional to 20,318.55, 28,056.90 and 12,777.50

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Solution

The fourth proportional to 20,318.55, 28,056.90 and 12,777.50 is: 17,643.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,318.55 : 28,056.90 = 12,777.50 : x
  2. Step 2: Convert to fraction form
    20,318.55/28,056.90 = 12,777.50/x
  3. Step 3: Cross multiply
    20,318.55x = 28,056.90 × 12,777.50
  4. Step 4: Simplify right side
    20,318.55x = 358,496,899.47
  5. Step 5: Solve for x
    x = 358,496,899.47/20,318.55
  6. Step 6: Final answer
    x = 17,643.82

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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.