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Finding the Fourth Proportional to 428,031, 639,235.65 and 343,918.92

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Solution

The fourth proportional to 428,031, 639,235.65 and 343,918.92 is: 513,619.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,031 : 639,235.65 = 343,918.92 : x
  2. Step 2: Convert to fraction form
    428,031/639,235.65 = 343,918.92/x
  3. Step 3: Cross multiply
    428,031x = 639,235.65 × 343,918.92
  4. Step 4: Simplify right side
    428,031x = 219,845,234,373.50
  5. Step 5: Solve for x
    x = 219,845,234,373.50/428,031
  6. Step 6: Final answer
    x = 513,619.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.