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Finding the Fourth Proportional to 428,695.59, 643,043.66 and 108,871.45

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Solution

The fourth proportional to 428,695.59, 643,043.66 and 108,871.45 is: 163,307.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,695.59 : 643,043.66 = 108,871.45 : x
  2. Step 2: Convert to fraction form
    428,695.59/643,043.66 = 108,871.45/x
  3. Step 3: Cross multiply
    428,695.59x = 643,043.66 × 108,871.45
  4. Step 4: Simplify right side
    428,695.59x = 70,009,094,342.08
  5. Step 5: Solve for x
    x = 70,009,094,342.08/428,695.59
  6. Step 6: Final answer
    x = 163,307.24

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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.