Home / 30,432.79-42,181.32-28,680.78

Finding the Fourth Proportional to 30,432.79, 42,181.32 and 28,680.78

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Solution

The fourth proportional to 30,432.79, 42,181.32 and 28,680.78 is: 39,752.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,432.79 : 42,181.32 = 28,680.78 : x
  2. Step 2: Convert to fraction form
    30,432.79/42,181.32 = 28,680.78/x
  3. Step 3: Cross multiply
    30,432.79x = 42,181.32 × 28,680.78
  4. Step 4: Simplify right side
    30,432.79x = 1,209,793,159.03
  5. Step 5: Solve for x
    x = 1,209,793,159.03/30,432.79
  6. Step 6: Final answer
    x = 39,752.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.