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Finding the Fourth Proportional to 21,018,712.80, 31,528,069.20 and 21,018,712.80

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Solution

The fourth proportional to 21,018,712.80, 31,528,069.20 and 21,018,712.80 is: 31,528,069.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018,712.80 : 31,528,069.20 = 21,018,712.80 : x
  2. Step 2: Convert to fraction form
    21,018,712.80/31,528,069.20 = 21,018,712.80/x
  3. Step 3: Cross multiply
    21,018,712.80x = 31,528,069.20 × 21,018,712.80
  4. Step 4: Simplify right side
    21,018,712.80x = 662,679,431,653,325.75
  5. Step 5: Solve for x
    x = 662,679,431,653,325.75/21,018,712.80
  6. Step 6: Final answer
    x = 31,528,069.20

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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.