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Finding the Fourth Proportional to 268,626.40, 402,478.80 and 128,082.40

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Solution

The fourth proportional to 268,626.40, 402,478.80 and 128,082.40 is: 191,903.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,626.40 : 402,478.80 = 128,082.40 : x
  2. Step 2: Convert to fraction form
    268,626.40/402,478.80 = 128,082.40/x
  3. Step 3: Cross multiply
    268,626.40x = 402,478.80 × 128,082.40
  4. Step 4: Simplify right side
    268,626.40x = 51,550,450,653.12
  5. Step 5: Solve for x
    x = 51,550,450,653.12/268,626.40
  6. Step 6: Final answer
    x = 191,903.89

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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.