Home / 438,421.20-657,804.60-172,136.40

Finding the Fourth Proportional to 438,421.20, 657,804.60 and 172,136.40

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Solution

The fourth proportional to 438,421.20, 657,804.60 and 172,136.40 is: 258,272.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,421.20 : 657,804.60 = 172,136.40 : x
  2. Step 2: Convert to fraction form
    438,421.20/657,804.60 = 172,136.40/x
  3. Step 3: Cross multiply
    438,421.20x = 657,804.60 × 172,136.40
  4. Step 4: Simplify right side
    438,421.20x = 113,232,115,747.44
  5. Step 5: Solve for x
    x = 113,232,115,747.44/438,421.20
  6. Step 6: Final answer
    x = 258,272.45

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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.