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Finding the Fourth Proportional to 254,015.21, 380,784.40 and 85,417.63

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Solution

The fourth proportional to 254,015.21, 380,784.40 and 85,417.63 is: 128,046.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    254,015.21 : 380,784.40 = 85,417.63 : x
  2. Step 2: Convert to fraction form
    254,015.21/380,784.40 = 85,417.63/x
  3. Step 3: Cross multiply
    254,015.21x = 380,784.40 × 85,417.63
  4. Step 4: Simplify right side
    254,015.21x = 32,525,700,988.97
  5. Step 5: Solve for x
    x = 32,525,700,988.97/254,015.21
  6. Step 6: Final answer
    x = 128,046.27

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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.