Home / 428,330.80-642,447.60-112,812.40

Finding the Fourth Proportional to 428,330.80, 642,447.60 and 112,812.40

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Solution

The fourth proportional to 428,330.80, 642,447.60 and 112,812.40 is: 169,205.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,330.80 : 642,447.60 = 112,812.40 : x
  2. Step 2: Convert to fraction form
    428,330.80/642,447.60 = 112,812.40/x
  3. Step 3: Cross multiply
    428,330.80x = 642,447.60 × 112,812.40
  4. Step 4: Simplify right side
    428,330.80x = 72,476,055,630.24
  5. Step 5: Solve for x
    x = 72,476,055,630.24/428,330.80
  6. Step 6: Final answer
    x = 169,205.80

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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.