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Finding the Fourth Proportional to 643,498.64, 888,011.20 and 353,109.32

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Solution

The fourth proportional to 643,498.64, 888,011.20 and 353,109.32 is: 487,281.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,498.64 : 888,011.20 = 353,109.32 : x
  2. Step 2: Convert to fraction form
    643,498.64/888,011.20 = 353,109.32/x
  3. Step 3: Cross multiply
    643,498.64x = 888,011.20 × 353,109.32
  4. Step 4: Simplify right side
    643,498.64x = 313,565,025,661.56
  5. Step 5: Solve for x
    x = 313,565,025,661.56/643,498.64
  6. Step 6: Final answer
    x = 487,281.57

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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.