Home / 621,499.72-857,642.10-380,187.40

Finding the Fourth Proportional to 621,499.72, 857,642.10 and 380,187.40

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Solution

The fourth proportional to 621,499.72, 857,642.10 and 380,187.40 is: 524,641.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,499.72 : 857,642.10 = 380,187.40 : x
  2. Step 2: Convert to fraction form
    621,499.72/857,642.10 = 380,187.40/x
  3. Step 3: Cross multiply
    621,499.72x = 857,642.10 × 380,187.40
  4. Step 4: Simplify right side
    621,499.72x = 326,064,720,129.54
  5. Step 5: Solve for x
    x = 326,064,720,129.54/621,499.72
  6. Step 6: Final answer
    x = 524,641.78

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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.