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Finding the Fourth Proportional to 782,872.88, 1,080,368.70 and 438,709.64

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Solution

The fourth proportional to 782,872.88, 1,080,368.70 and 438,709.64 is: 605,421.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    782,872.88 : 1,080,368.70 = 438,709.64 : x
  2. Step 2: Convert to fraction form
    782,872.88/1,080,368.70 = 438,709.64/x
  3. Step 3: Cross multiply
    782,872.88x = 1,080,368.70 × 438,709.64
  4. Step 4: Simplify right side
    782,872.88x = 473,968,163,444.27
  5. Step 5: Solve for x
    x = 473,968,163,444.27/782,872.88
  6. Step 6: Final answer
    x = 605,421.62

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1.5x scale

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.