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Finding the Fourth Proportional to 21,371,905,880.80, 29,859,515,280.80 and 21,371,905,880.80

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Solution

The fourth proportional to 21,371,905,880.80, 29,859,515,280.80 and 21,371,905,880.80 is: 29,859,515,280.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,371,905,880.80 : 29,859,515,280.80 = 21,371,905,880.80 : x
  2. Step 2: Convert to fraction form
    21,371,905,880.80/29,859,515,280.80 = 21,371,905,880.80/x
  3. Step 3: Cross multiply
    21,371,905,880.80x = 29,859,515,280.80 × 21,371,905,880.80
  4. Step 4: Simplify right side
    21,371,905,880.80x = 638,154,750,227,566,952,448
  5. Step 5: Solve for x
    x = 638,154,750,227,566,952,448/21,371,905,880.80
  6. Step 6: Final answer
    x = 29,859,515,280.80

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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.