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Finding the Fourth Proportional to 660,404.64, 911,306.79 and 388,482.78

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Solution

The fourth proportional to 660,404.64, 911,306.79 and 388,482.78 is: 536,075.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,404.64 : 911,306.79 = 388,482.78 : x
  2. Step 2: Convert to fraction form
    660,404.64/911,306.79 = 388,482.78/x
  3. Step 3: Cross multiply
    660,404.64x = 911,306.79 × 388,482.78
  4. Step 4: Simplify right side
    660,404.64x = 354,026,995,212.08
  5. Step 5: Solve for x
    x = 354,026,995,212.08/660,404.64
  6. Step 6: Final answer
    x = 536,075.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.