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Finding the Fourth Proportional to 408,435.40, 611,340.90 and 290,337.40

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Solution

The fourth proportional to 408,435.40, 611,340.90 and 290,337.40 is: 434,573.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,435.40 : 611,340.90 = 290,337.40 : x
  2. Step 2: Convert to fraction form
    408,435.40/611,340.90 = 290,337.40/x
  3. Step 3: Cross multiply
    408,435.40x = 611,340.90 × 290,337.40
  4. Step 4: Simplify right side
    408,435.40x = 177,495,127,419.66
  5. Step 5: Solve for x
    x = 177,495,127,419.66/408,435.40
  6. Step 6: Final answer
    x = 434,573.32

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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.