Home / 643,428.09-887,931.81-356,948.18

Finding the Fourth Proportional to 643,428.09, 887,931.81 and 356,948.18

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Solution

The fourth proportional to 643,428.09, 887,931.81 and 356,948.18 is: 492,589.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,428.09 : 887,931.81 = 356,948.18 : x
  2. Step 2: Convert to fraction form
    643,428.09/887,931.81 = 356,948.18/x
  3. Step 3: Cross multiply
    643,428.09x = 887,931.81 × 356,948.18
  4. Step 4: Simplify right side
    643,428.09x = 316,945,639,103.95
  5. Step 5: Solve for x
    x = 316,945,639,103.95/643,428.09
  6. Step 6: Final answer
    x = 492,589.06

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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.