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Finding the Fourth Proportional to 70,140.80, 105,211.20 and 42,492.80

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Solution

The fourth proportional to 70,140.80, 105,211.20 and 42,492.80 is: 63,739.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,140.80 : 105,211.20 = 42,492.80 : x
  2. Step 2: Convert to fraction form
    70,140.80/105,211.20 = 42,492.80/x
  3. Step 3: Cross multiply
    70,140.80x = 105,211.20 × 42,492.80
  4. Step 4: Simplify right side
    70,140.80x = 4,470,718,479.36
  5. Step 5: Solve for x
    x = 4,470,718,479.36/70,140.80
  6. Step 6: Final answer
    x = 63,739.20

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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.