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Finding the Fourth Proportional to 643,896.60, 888,580.80 and 402,319.35

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Solution

The fourth proportional to 643,896.60, 888,580.80 and 402,319.35 is: 555,202.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,896.60 : 888,580.80 = 402,319.35 : x
  2. Step 2: Convert to fraction form
    643,896.60/888,580.80 = 402,319.35/x
  3. Step 3: Cross multiply
    643,896.60x = 888,580.80 × 402,319.35
  4. Step 4: Simplify right side
    643,896.60x = 357,493,249,878.48
  5. Step 5: Solve for x
    x = 357,493,249,878.48/643,896.60
  6. Step 6: Final answer
    x = 555,202.88

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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.