Home / 428,865.91-643,508.45-303,312.97

Finding the Fourth Proportional to 428,865.91, 643,508.45 and 303,312.97

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Solution

The fourth proportional to 428,865.91, 643,508.45 and 303,312.97 is: 455,117.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,865.91 : 643,508.45 = 303,312.97 : x
  2. Step 2: Convert to fraction form
    428,865.91/643,508.45 = 303,312.97/x
  3. Step 3: Cross multiply
    428,865.91x = 643,508.45 × 303,312.97
  4. Step 4: Simplify right side
    428,865.91x = 195,184,459,614.84
  5. Step 5: Solve for x
    x = 195,184,459,614.84/428,865.91
  6. Step 6: Final answer
    x = 455,117.69

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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.