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Finding the Fourth Proportional to 20,779,840.30, 31,098,901.65 and 20,779,840.30

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Solution

The fourth proportional to 20,779,840.30, 31,098,901.65 and 20,779,840.30 is: 31,098,901.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779,840.30 : 31,098,901.65 = 20,779,840.30 : x
  2. Step 2: Convert to fraction form
    20,779,840.30/31,098,901.65 = 20,779,840.30/x
  3. Step 3: Cross multiply
    20,779,840.30x = 31,098,901.65 × 20,779,840.30
  4. Step 4: Simplify right side
    20,779,840.30x = 646,230,209,792,406.50
  5. Step 5: Solve for x
    x = 646,230,209,792,406.50/20,779,840.30
  6. Step 6: Final answer
    x = 31,098,901.65

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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.