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Finding the Fourth Proportional to 281,452.68, 388,386.90 and 154,129.80

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Solution

The fourth proportional to 281,452.68, 388,386.90 and 154,129.80 is: 212,689.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,452.68 : 388,386.90 = 154,129.80 : x
  2. Step 2: Convert to fraction form
    281,452.68/388,386.90 = 154,129.80/x
  3. Step 3: Cross multiply
    281,452.68x = 388,386.90 × 154,129.80
  4. Step 4: Simplify right side
    281,452.68x = 59,861,995,219.62
  5. Step 5: Solve for x
    x = 59,861,995,219.62/281,452.68
  6. Step 6: Final answer
    x = 212,689.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.