Home / 20,779.81-31,037.11-18,802.40

Finding the Fourth Proportional to 20,779.81, 31,037.11 and 18,802.40

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Solution

The fourth proportional to 20,779.81, 31,037.11 and 18,802.40 is: 28,083.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.81 : 31,037.11 = 18,802.40 : x
  2. Step 2: Convert to fraction form
    20,779.81/31,037.11 = 18,802.40/x
  3. Step 3: Cross multiply
    20,779.81x = 31,037.11 × 18,802.40
  4. Step 4: Simplify right side
    20,779.81x = 583,572,060.64
  5. Step 5: Solve for x
    x = 583,572,060.64/20,779.81
  6. Step 6: Final answer
    x = 28,083.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.