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Finding the Fourth Proportional to 70,490.05, 105,660.82 and 28,400.02

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Solution

The fourth proportional to 70,490.05, 105,660.82 and 28,400.02 is: 42,570.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,490.05 : 105,660.82 = 28,400.02 : x
  2. Step 2: Convert to fraction form
    70,490.05/105,660.82 = 28,400.02/x
  3. Step 3: Cross multiply
    70,490.05x = 105,660.82 × 28,400.02
  4. Step 4: Simplify right side
    70,490.05x = 3,000,768,730.91
  5. Step 5: Solve for x
    x = 3,000,768,730.91/70,490.05
  6. Step 6: Final answer
    x = 42,570.11

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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.