Home / 428,746.80-643,120.20-148,292.40

Finding the Fourth Proportional to 428,746.80, 643,120.20 and 148,292.40

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Solution

The fourth proportional to 428,746.80, 643,120.20 and 148,292.40 is: 222,438.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,746.80 : 643,120.20 = 148,292.40 : x
  2. Step 2: Convert to fraction form
    428,746.80/643,120.20 = 148,292.40/x
  3. Step 3: Cross multiply
    428,746.80x = 643,120.20 × 148,292.40
  4. Step 4: Simplify right side
    428,746.80x = 95,369,837,946.48
  5. Step 5: Solve for x
    x = 95,369,837,946.48/428,746.80
  6. Step 6: Final answer
    x = 222,438.60

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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.