Home / 1,387,420.20-2,079,747.90-638,159.40

Finding the Fourth Proportional to 1,387,420.20, 2,079,747.90 and 638,159.40

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Solution

The fourth proportional to 1,387,420.20, 2,079,747.90 and 638,159.40 is: 956,603.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,420.20 : 2,079,747.90 = 638,159.40 : x
  2. Step 2: Convert to fraction form
    1,387,420.20/2,079,747.90 = 638,159.40/x
  3. Step 3: Cross multiply
    1,387,420.20x = 2,079,747.90 × 638,159.40
  4. Step 4: Simplify right side
    1,387,420.20x = 1,327,210,672,015.26
  5. Step 5: Solve for x
    x = 1,327,210,672,015.26/1,387,420.20
  6. Step 6: Final answer
    x = 956,603.25

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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.