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Finding the Fourth Proportional to 91,091.80, 136,929.30 and 64,977.40

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Solution

The fourth proportional to 91,091.80, 136,929.30 and 64,977.40 is: 97,674.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,091.80 : 136,929.30 = 64,977.40 : x
  2. Step 2: Convert to fraction form
    91,091.80/136,929.30 = 64,977.40/x
  3. Step 3: Cross multiply
    91,091.80x = 136,929.30 × 64,977.40
  4. Step 4: Simplify right side
    91,091.80x = 8,897,309,897.82
  5. Step 5: Solve for x
    x = 8,897,309,897.82/91,091.80
  6. Step 6: Final answer
    x = 97,674.10

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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.