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Finding the Fourth Proportional to 428,871.60, 643,307.40 and 113,360.40

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Solution

The fourth proportional to 428,871.60, 643,307.40 and 113,360.40 is: 170,040.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,871.60 : 643,307.40 = 113,360.40 : x
  2. Step 2: Convert to fraction form
    428,871.60/643,307.40 = 113,360.40/x
  3. Step 3: Cross multiply
    428,871.60x = 643,307.40 × 113,360.40
  4. Step 4: Simplify right side
    428,871.60x = 72,925,584,186.96
  5. Step 5: Solve for x
    x = 72,925,584,186.96/428,871.60
  6. Step 6: Final answer
    x = 170,040.60

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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.