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Finding the Fourth Proportional to 290,661.20, 401,065.80 and 163,336.40

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Solution

The fourth proportional to 290,661.20, 401,065.80 and 163,336.40 is: 225,378.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,661.20 : 401,065.80 = 163,336.40 : x
  2. Step 2: Convert to fraction form
    290,661.20/401,065.80 = 163,336.40/x
  3. Step 3: Cross multiply
    290,661.20x = 401,065.80 × 163,336.40
  4. Step 4: Simplify right side
    290,661.20x = 65,508,643,935.12
  5. Step 5: Solve for x
    x = 65,508,643,935.12/290,661.20
  6. Step 6: Final answer
    x = 225,378.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.