Home / 428,860.80-643,291.20-385,315.20

Finding the Fourth Proportional to 428,860.80, 643,291.20 and 385,315.20

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Solution

The fourth proportional to 428,860.80, 643,291.20 and 385,315.20 is: 577,972.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,860.80 : 643,291.20 = 385,315.20 : x
  2. Step 2: Convert to fraction form
    428,860.80/643,291.20 = 385,315.20/x
  3. Step 3: Cross multiply
    428,860.80x = 643,291.20 × 385,315.20
  4. Step 4: Simplify right side
    428,860.80x = 247,869,877,386.24
  5. Step 5: Solve for x
    x = 247,869,877,386.24/428,860.80
  6. Step 6: Final answer
    x = 577,972.80

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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.