Home / 28,290.81-42,385.59-18,902.40

Finding the Fourth Proportional to 28,290.81, 42,385.59 and 18,902.40

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Solution

The fourth proportional to 28,290.81, 42,385.59 and 18,902.40 is: 28,319.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,290.81 : 42,385.59 = 18,902.40 : x
  2. Step 2: Convert to fraction form
    28,290.81/42,385.59 = 18,902.40/x
  3. Step 3: Cross multiply
    28,290.81x = 42,385.59 × 18,902.40
  4. Step 4: Simplify right side
    28,290.81x = 801,189,376.42
  5. Step 5: Solve for x
    x = 801,189,376.42/28,290.81
  6. Step 6: Final answer
    x = 28,319.78

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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.