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Finding the Fourth Proportional to 268,544.40, 402,355.80 and 128,000.40

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Solution

The fourth proportional to 268,544.40, 402,355.80 and 128,000.40 is: 191,780.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,544.40 : 402,355.80 = 128,000.40 : x
  2. Step 2: Convert to fraction form
    268,544.40/402,355.80 = 128,000.40/x
  3. Step 3: Cross multiply
    268,544.40x = 402,355.80 × 128,000.40
  4. Step 4: Simplify right side
    268,544.40x = 51,501,703,342.32
  5. Step 5: Solve for x
    x = 51,501,703,342.32/268,544.40
  6. Step 6: Final answer
    x = 191,780.96

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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.