Home / 20,430.16-28,205.44-13,368.90

Finding the Fourth Proportional to 20,430.16, 28,205.44 and 13,368.90

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Solution

The fourth proportional to 20,430.16, 28,205.44 and 13,368.90 is: 18,456.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.16 : 28,205.44 = 13,368.90 : x
  2. Step 2: Convert to fraction form
    20,430.16/28,205.44 = 13,368.90/x
  3. Step 3: Cross multiply
    20,430.16x = 28,205.44 × 13,368.90
  4. Step 4: Simplify right side
    20,430.16x = 377,075,706.82
  5. Step 5: Solve for x
    x = 377,075,706.82/20,430.16
  6. Step 6: Final answer
    x = 18,456.82

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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.