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Finding the Fourth Proportional to 318,720.31, 477,905.48 and 218,905.63

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Solution

The fourth proportional to 318,720.31, 477,905.48 and 218,905.63 is: 328,238.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,720.31 : 477,905.48 = 218,905.63 : x
  2. Step 2: Convert to fraction form
    318,720.31/477,905.48 = 218,905.63/x
  3. Step 3: Cross multiply
    318,720.31x = 477,905.48 × 218,905.63
  4. Step 4: Simplify right side
    318,720.31x = 104,616,199,085.32
  5. Step 5: Solve for x
    x = 104,616,199,085.32/318,720.31
  6. Step 6: Final answer
    x = 328,238.26

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1.5x scale

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.