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Finding the Fourth Proportional to 640,831,490.40, 899,204,820 and 640,831,490.40

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Solution

The fourth proportional to 640,831,490.40, 899,204,820 and 640,831,490.40 is: 899,204,820

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,831,490.40 : 899,204,820 = 640,831,490.40 : x
  2. Step 2: Convert to fraction form
    640,831,490.40/899,204,820 = 640,831,490.40/x
  3. Step 3: Cross multiply
    640,831,490.40x = 899,204,820 × 640,831,490.40
  4. Step 4: Simplify right side
    640,831,490.40x = 576,238,764,975,463,680
  5. Step 5: Solve for x
    x = 576,238,764,975,463,680/640,831,490.40
  6. Step 6: Final answer
    x = 899,204,820

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.