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Finding the Fourth Proportional to 268,437.20, 402,655.80 and 128,469.20

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Solution

The fourth proportional to 268,437.20, 402,655.80 and 128,469.20 is: 192,703.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,437.20 : 402,655.80 = 128,469.20 : x
  2. Step 2: Convert to fraction form
    268,437.20/402,655.80 = 128,469.20/x
  3. Step 3: Cross multiply
    268,437.20x = 402,655.80 × 128,469.20
  4. Step 4: Simplify right side
    268,437.20x = 51,728,868,501.36
  5. Step 5: Solve for x
    x = 51,728,868,501.36/268,437.20
  6. Step 6: Final answer
    x = 192,703.80

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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.