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Finding the Fourth Proportional to 679,223.32, 938,284.92 and 643,351.06

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Solution

The fourth proportional to 679,223.32, 938,284.92 and 643,351.06 is: 888,730.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,223.32 : 938,284.92 = 643,351.06 : x
  2. Step 2: Convert to fraction form
    679,223.32/938,284.92 = 643,351.06/x
  3. Step 3: Cross multiply
    679,223.32x = 938,284.92 × 643,351.06
  4. Step 4: Simplify right side
    679,223.32x = 603,646,597,864.02
  5. Step 5: Solve for x
    x = 603,646,597,864.02/679,223.32
  6. Step 6: Final answer
    x = 888,730.67

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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.