Home / 21,438.08-32,113.20-12,646.40

Finding the Fourth Proportional to 21,438.08, 32,113.20 and 12,646.40

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Solution

The fourth proportional to 21,438.08, 32,113.20 and 12,646.40 is: 18,943.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,438.08 : 32,113.20 = 12,646.40 : x
  2. Step 2: Convert to fraction form
    21,438.08/32,113.20 = 12,646.40/x
  3. Step 3: Cross multiply
    21,438.08x = 32,113.20 × 12,646.40
  4. Step 4: Simplify right side
    21,438.08x = 406,116,372.48
  5. Step 5: Solve for x
    x = 406,116,372.48/21,438.08
  6. Step 6: Final answer
    x = 18,943.69

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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.