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Finding the Fourth Proportional to 387,445.96, 534,638.74 and 215,343.50

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Solution

The fourth proportional to 387,445.96, 534,638.74 and 215,343.50 is: 297,153.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,445.96 : 534,638.74 = 215,343.50 : x
  2. Step 2: Convert to fraction form
    387,445.96/534,638.74 = 215,343.50/x
  3. Step 3: Cross multiply
    387,445.96x = 534,638.74 × 215,343.50
  4. Step 4: Simplify right side
    387,445.96x = 115,130,977,507.19
  5. Step 5: Solve for x
    x = 115,130,977,507.19/387,445.96
  6. Step 6: Final answer
    x = 297,153.64

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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.