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Finding the Fourth Proportional to 639,043.90, 957,399.45 and 520,071.10

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Solution

The fourth proportional to 639,043.90, 957,399.45 and 520,071.10 is: 779,157.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,043.90 : 957,399.45 = 520,071.10 : x
  2. Step 2: Convert to fraction form
    639,043.90/957,399.45 = 520,071.10/x
  3. Step 3: Cross multiply
    639,043.90x = 957,399.45 × 520,071.10
  4. Step 4: Simplify right side
    639,043.90x = 497,915,785,100.90
  5. Step 5: Solve for x
    x = 497,915,785,100.90/639,043.90
  6. Step 6: Final answer
    x = 779,157.40

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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.