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Finding the Fourth Proportional to 643,513.12, 888,045.66 and 353,129.56

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Solution

The fourth proportional to 643,513.12, 888,045.66 and 353,129.56 is: 487,317.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,513.12 : 888,045.66 = 353,129.56 : x
  2. Step 2: Convert to fraction form
    643,513.12/888,045.66 = 353,129.56/x
  3. Step 3: Cross multiply
    643,513.12x = 888,045.66 × 353,129.56
  4. Step 4: Simplify right side
    643,513.12x = 313,595,173,175.71
  5. Step 5: Solve for x
    x = 313,595,173,175.71/643,513.12
  6. Step 6: Final answer
    x = 487,317.45

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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.