Home / 280,543,742.20-420,825,236.10-86,453,615.80

Finding the Fourth Proportional to 280,543,742.20, 420,825,236.10 and 86,453,615.80

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Solution

The fourth proportional to 280,543,742.20, 420,825,236.10 and 86,453,615.80 is: 129,683,389.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,543,742.20 : 420,825,236.10 = 86,453,615.80 : x
  2. Step 2: Convert to fraction form
    280,543,742.20/420,825,236.10 = 86,453,615.80/x
  3. Step 3: Cross multiply
    280,543,742.20x = 420,825,236.10 × 86,453,615.80
  4. Step 4: Simplify right side
    280,543,742.20x = 36,381,863,280,733,688
  5. Step 5: Solve for x
    x = 36,381,863,280,733,688/280,543,742.20
  6. Step 6: Final answer
    x = 129,683,389.11

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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.