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Finding the Fourth Proportional to 639,045.40, 957,401.70 and 520,072.60

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Solution

The fourth proportional to 639,045.40, 957,401.70 and 520,072.60 is: 779,159.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,045.40 : 957,401.70 = 520,072.60 : x
  2. Step 2: Convert to fraction form
    639,045.40/957,401.70 = 520,072.60/x
  3. Step 3: Cross multiply
    639,045.40x = 957,401.70 × 520,072.60
  4. Step 4: Simplify right side
    639,045.40x = 497,918,391,363.42
  5. Step 5: Solve for x
    x = 497,918,391,363.42/639,045.40
  6. Step 6: Final answer
    x = 779,159.65

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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.