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Finding the Fourth Proportional to 640,991,952.32, 961,486,433.28 and 421,051,606.72

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Solution

The fourth proportional to 640,991,952.32, 961,486,433.28 and 421,051,606.72 is: 631,576,427.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,991,952.32 : 961,486,433.28 = 421,051,606.72 : x
  2. Step 2: Convert to fraction form
    640,991,952.32/961,486,433.28 = 421,051,606.72/x
  3. Step 3: Cross multiply
    640,991,952.32x = 961,486,433.28 × 421,051,606.72
  4. Step 4: Simplify right side
    640,991,952.32x = 404,835,407,572,026,112
  5. Step 5: Solve for x
    x = 404,835,407,572,026,112/640,991,952.32
  6. Step 6: Final answer
    x = 631,576,427.92

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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.