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Finding the Fourth Proportional to 161,390.40, 241,970.40 and 91,291.20

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Solution

The fourth proportional to 161,390.40, 241,970.40 and 91,291.20 is: 136,871.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    161,390.40 : 241,970.40 = 91,291.20 : x
  2. Step 2: Convert to fraction form
    161,390.40/241,970.40 = 91,291.20/x
  3. Step 3: Cross multiply
    161,390.40x = 241,970.40 × 91,291.20
  4. Step 4: Simplify right side
    161,390.40x = 22,089,768,180.48
  5. Step 5: Solve for x
    x = 22,089,768,180.48/161,390.40
  6. Step 6: Final answer
    x = 136,871.64

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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.