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Finding the Fourth Proportional to 35,421.20, 53,131.80 and 20,646.80

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Solution

The fourth proportional to 35,421.20, 53,131.80 and 20,646.80 is: 30,970.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    35,421.20 : 53,131.80 = 20,646.80 : x
  2. Step 2: Convert to fraction form
    35,421.20/53,131.80 = 20,646.80/x
  3. Step 3: Cross multiply
    35,421.20x = 53,131.80 × 20,646.80
  4. Step 4: Simplify right side
    35,421.20x = 1,097,001,648.24
  5. Step 5: Solve for x
    x = 1,097,001,648.24/35,421.20
  6. Step 6: Final answer
    x = 30,970.20

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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.