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Finding the Fourth Proportional to 639,689.40, 882,767.58 and 353,207.16

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Solution

The fourth proportional to 639,689.40, 882,767.58 and 353,207.16 is: 487,423.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,689.40 : 882,767.58 = 353,207.16 : x
  2. Step 2: Convert to fraction form
    639,689.40/882,767.58 = 353,207.16/x
  3. Step 3: Cross multiply
    639,689.40x = 882,767.58 × 353,207.16
  4. Step 4: Simplify right side
    639,689.40x = 311,799,829,871.87
  5. Step 5: Solve for x
    x = 311,799,829,871.87/639,689.40
  6. Step 6: Final answer
    x = 487,423.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.