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Finding the Fourth Proportional to 664,981.12, 917,740 and 396,709.12

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Solution

The fourth proportional to 664,981.12, 917,740 and 396,709.12 is: 547,497.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,981.12 : 917,740 = 396,709.12 : x
  2. Step 2: Convert to fraction form
    664,981.12/917,740 = 396,709.12/x
  3. Step 3: Cross multiply
    664,981.12x = 917,740 × 396,709.12
  4. Step 4: Simplify right side
    664,981.12x = 364,075,827,788.80
  5. Step 5: Solve for x
    x = 364,075,827,788.80/664,981.12
  6. Step 6: Final answer
    x = 547,497.99

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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.