Home / 579,740.20-869,610.30-390,783.40

Finding the Fourth Proportional to 579,740.20, 869,610.30 and 390,783.40

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Solution

The fourth proportional to 579,740.20, 869,610.30 and 390,783.40 is: 586,175.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,740.20 : 869,610.30 = 390,783.40 : x
  2. Step 2: Convert to fraction form
    579,740.20/869,610.30 = 390,783.40/x
  3. Step 3: Cross multiply
    579,740.20x = 869,610.30 × 390,783.40
  4. Step 4: Simplify right side
    579,740.20x = 339,829,269,709.02
  5. Step 5: Solve for x
    x = 339,829,269,709.02/579,740.20
  6. Step 6: Final answer
    x = 586,175.10

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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.