Home / 428,749.12-643,148.76-144,415.88

Finding the Fourth Proportional to 428,749.12, 643,148.76 and 144,415.88

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Solution

The fourth proportional to 428,749.12, 643,148.76 and 144,415.88 is: 216,632.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,749.12 : 643,148.76 = 144,415.88 : x
  2. Step 2: Convert to fraction form
    428,749.12/643,148.76 = 144,415.88/x
  3. Step 3: Cross multiply
    428,749.12x = 643,148.76 × 144,415.88
  4. Step 4: Simplify right side
    428,749.12x = 92,880,894,146.31
  5. Step 5: Solve for x
    x = 92,880,894,146.31/428,749.12
  6. Step 6: Final answer
    x = 216,632.27

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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.