Home / 428,909.01-643,368.14-129,392.18

Finding the Fourth Proportional to 428,909.01, 643,368.14 and 129,392.18

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Solution

The fourth proportional to 428,909.01, 643,368.14 and 129,392.18 is: 194,089.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,909.01 : 643,368.14 = 129,392.18 : x
  2. Step 2: Convert to fraction form
    428,909.01/643,368.14 = 129,392.18/x
  3. Step 3: Cross multiply
    428,909.01x = 643,368.14 × 129,392.18
  4. Step 4: Simplify right side
    428,909.01x = 83,246,806,177.15
  5. Step 5: Solve for x
    x = 83,246,806,177.15/428,909.01
  6. Step 6: Final answer
    x = 194,089.67

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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.