Home / 428,961.64-643,426.28-129,434.23

Finding the Fourth Proportional to 428,961.64, 643,426.28 and 129,434.23

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Solution

The fourth proportional to 428,961.64, 643,426.28 and 129,434.23 is: 194,146.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,961.64 : 643,426.28 = 129,434.23 : x
  2. Step 2: Convert to fraction form
    428,961.64/643,426.28 = 129,434.23/x
  3. Step 3: Cross multiply
    428,961.64x = 643,426.28 × 129,434.23
  4. Step 4: Simplify right side
    428,961.64x = 83,281,385,113.56
  5. Step 5: Solve for x
    x = 83,281,385,113.56/428,961.64
  6. Step 6: Final answer
    x = 194,146.46

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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.