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Finding the Fourth Proportional to 639,709,506.40, 959,564,252.40 and 155,035,314.40

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Solution

The fourth proportional to 639,709,506.40, 959,564,252.40 and 155,035,314.40 is: 232,552,969.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,709,506.40 : 959,564,252.40 = 155,035,314.40 : x
  2. Step 2: Convert to fraction form
    639,709,506.40/959,564,252.40 = 155,035,314.40/x
  3. Step 3: Cross multiply
    639,709,506.40x = 959,564,252.40 × 155,035,314.40
  4. Step 4: Simplify right side
    639,709,506.40x = 148,766,345,557,834,944
  5. Step 5: Solve for x
    x = 148,766,345,557,834,944/639,709,506.40
  6. Step 6: Final answer
    x = 232,552,969.86

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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.