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Finding the Fourth Proportional to 281,415.28, 388,349.23 and 154,090.87

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Solution

The fourth proportional to 281,415.28, 388,349.23 and 154,090.87 is: 212,643.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,415.28 : 388,349.23 = 154,090.87 : x
  2. Step 2: Convert to fraction form
    281,415.28/388,349.23 = 154,090.87/x
  3. Step 3: Cross multiply
    281,415.28x = 388,349.23 × 154,090.87
  4. Step 4: Simplify right side
    281,415.28x = 59,841,070,714.53
  5. Step 5: Solve for x
    x = 59,841,070,714.53/281,415.28
  6. Step 6: Final answer
    x = 212,643.29

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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.