Home / 28,355.28-42,530.40-8,638.20

Finding the Fourth Proportional to 28,355.28, 42,530.40 and 8,638.20

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Solution

The fourth proportional to 28,355.28, 42,530.40 and 8,638.20 is: 12,956.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.28 : 42,530.40 = 8,638.20 : x
  2. Step 2: Convert to fraction form
    28,355.28/42,530.40 = 8,638.20/x
  3. Step 3: Cross multiply
    28,355.28x = 42,530.40 × 8,638.20
  4. Step 4: Simplify right side
    28,355.28x = 367,386,101.28
  5. Step 5: Solve for x
    x = 367,386,101.28/28,355.28
  6. Step 6: Final answer
    x = 12,956.53

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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.