Home / 28,419.76-42,630-10,890.64

Finding the Fourth Proportional to 28,419.76, 42,630 and 10,890.64

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Solution

The fourth proportional to 28,419.76, 42,630 and 10,890.64 is: 16,336.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,419.76 : 42,630 = 10,890.64 : x
  2. Step 2: Convert to fraction form
    28,419.76/42,630 = 10,890.64/x
  3. Step 3: Cross multiply
    28,419.76x = 42,630 × 10,890.64
  4. Step 4: Simplify right side
    28,419.76x = 464,267,983.20
  5. Step 5: Solve for x
    x = 464,267,983.20/28,419.76
  6. Step 6: Final answer
    x = 16,336.10

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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.