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Finding the Fourth Proportional to 51,990.80, 77,986.20 and 51,553.40

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Solution

The fourth proportional to 51,990.80, 77,986.20 and 51,553.40 is: 77,330.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    51,990.80 : 77,986.20 = 51,553.40 : x
  2. Step 2: Convert to fraction form
    51,990.80/77,986.20 = 51,553.40/x
  3. Step 3: Cross multiply
    51,990.80x = 77,986.20 × 51,553.40
  4. Step 4: Simplify right side
    51,990.80x = 4,020,453,763.08
  5. Step 5: Solve for x
    x = 4,020,453,763.08/51,990.80
  6. Step 6: Final answer
    x = 77,330.10

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1.5x scale

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.