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Finding the Fourth Proportional to 113,386.60, 169,971.90 and 42,290.20

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Solution

The fourth proportional to 113,386.60, 169,971.90 and 42,290.20 is: 63,395.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,386.60 : 169,971.90 = 42,290.20 : x
  2. Step 2: Convert to fraction form
    113,386.60/169,971.90 = 42,290.20/x
  3. Step 3: Cross multiply
    113,386.60x = 169,971.90 × 42,290.20
  4. Step 4: Simplify right side
    113,386.60x = 7,188,145,645.38
  5. Step 5: Solve for x
    x = 7,188,145,645.38/113,386.60
  6. Step 6: Final answer
    x = 63,395.02

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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.