Home / 21,158.30-29,139.40-20,699.03

Finding the Fourth Proportional to 21,158.30, 29,139.40 and 20,699.03

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Solution

The fourth proportional to 21,158.30, 29,139.40 and 20,699.03 is: 28,506.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,158.30 : 29,139.40 = 20,699.03 : x
  2. Step 2: Convert to fraction form
    21,158.30/29,139.40 = 20,699.03/x
  3. Step 3: Cross multiply
    21,158.30x = 29,139.40 × 20,699.03
  4. Step 4: Simplify right side
    21,158.30x = 603,157,314.78
  5. Step 5: Solve for x
    x = 603,157,314.78/21,158.30
  6. Step 6: Final answer
    x = 28,506.89

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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.