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Finding the Fourth Proportional to 70,424.70, 105,636.90 and 28,304.70

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Solution

The fourth proportional to 70,424.70, 105,636.90 and 28,304.70 is: 42,456.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,424.70 : 105,636.90 = 28,304.70 : x
  2. Step 2: Convert to fraction form
    70,424.70/105,636.90 = 28,304.70/x
  3. Step 3: Cross multiply
    70,424.70x = 105,636.90 × 28,304.70
  4. Step 4: Simplify right side
    70,424.70x = 2,990,020,763.43
  5. Step 5: Solve for x
    x = 2,990,020,763.43/70,424.70
  6. Step 6: Final answer
    x = 42,456.99

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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.