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Finding the Fourth Proportional to 391,444.31, 540,453.38 and 300,638.01

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Solution

The fourth proportional to 391,444.31, 540,453.38 and 300,638.01 is: 415,080.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,444.31 : 540,453.38 = 300,638.01 : x
  2. Step 2: Convert to fraction form
    391,444.31/540,453.38 = 300,638.01/x
  3. Step 3: Cross multiply
    391,444.31x = 540,453.38 × 300,638.01
  4. Step 4: Simplify right side
    391,444.31x = 162,480,827,157.78
  5. Step 5: Solve for x
    x = 162,480,827,157.78/391,444.31
  6. Step 6: Final answer
    x = 415,080.32

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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.