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Finding the Fourth Proportional to 1,326,748.80, 1,987,934.40 and 764,803.20

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Solution

The fourth proportional to 1,326,748.80, 1,987,934.40 and 764,803.20 is: 1,145,943.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326,748.80 : 1,987,934.40 = 764,803.20 : x
  2. Step 2: Convert to fraction form
    1,326,748.80/1,987,934.40 = 764,803.20/x
  3. Step 3: Cross multiply
    1,326,748.80x = 1,987,934.40 × 764,803.20
  4. Step 4: Simplify right side
    1,326,748.80x = 1,520,378,590,510.08
  5. Step 5: Solve for x
    x = 1,520,378,590,510.08/1,326,748.80
  6. Step 6: Final answer
    x = 1,145,943.07

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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.