Home / 20,918.10-31,376.95-5,123.21

Finding the Fourth Proportional to 20,918.10, 31,376.95 and 5,123.21

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Solution

The fourth proportional to 20,918.10, 31,376.95 and 5,123.21 is: 7,684.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.10 : 31,376.95 = 5,123.21 : x
  2. Step 2: Convert to fraction form
    20,918.10/31,376.95 = 5,123.21/x
  3. Step 3: Cross multiply
    20,918.10x = 31,376.95 × 5,123.21
  4. Step 4: Simplify right side
    20,918.10x = 160,750,534.32
  5. Step 5: Solve for x
    x = 160,750,534.32/20,918.10
  6. Step 6: Final answer
    x = 7,684.76

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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.