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Finding the Fourth Proportional to 445,567.90, 668,351.85 and 391,330.30

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Solution

The fourth proportional to 445,567.90, 668,351.85 and 391,330.30 is: 586,995.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,567.90 : 668,351.85 = 391,330.30 : x
  2. Step 2: Convert to fraction form
    445,567.90/668,351.85 = 391,330.30/x
  3. Step 3: Cross multiply
    445,567.90x = 668,351.85 × 391,330.30
  4. Step 4: Simplify right side
    445,567.90x = 261,546,329,966.06
  5. Step 5: Solve for x
    x = 261,546,329,966.06/445,567.90
  6. Step 6: Final answer
    x = 586,995.45

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Double scale
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Similar ratio
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1.5x scale

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.