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Finding the Fourth Proportional to 91,209.80, 136,814.70 and 56,035.40

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Solution

The fourth proportional to 91,209.80, 136,814.70 and 56,035.40 is: 84,053.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,209.80 : 136,814.70 = 56,035.40 : x
  2. Step 2: Convert to fraction form
    91,209.80/136,814.70 = 56,035.40/x
  3. Step 3: Cross multiply
    91,209.80x = 136,814.70 × 56,035.40
  4. Step 4: Simplify right side
    91,209.80x = 7,666,466,440.38
  5. Step 5: Solve for x
    x = 7,666,466,440.38/91,209.80
  6. Step 6: Final answer
    x = 84,053.10

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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.