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Finding the Fourth Proportional to 283,141.21, 390,734.64 and 155,816.80

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Solution

The fourth proportional to 283,141.21, 390,734.64 and 155,816.80 is: 215,027.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,141.21 : 390,734.64 = 155,816.80 : x
  2. Step 2: Convert to fraction form
    283,141.21/390,734.64 = 155,816.80/x
  3. Step 3: Cross multiply
    283,141.21x = 390,734.64 × 155,816.80
  4. Step 4: Simplify right side
    283,141.21x = 60,883,020,474.87
  5. Step 5: Solve for x
    x = 60,883,020,474.87/283,141.21
  6. Step 6: Final answer
    x = 215,027.06

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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.