Home / 78,390.40-117,585.60-25,805.20

Finding the Fourth Proportional to 78,390.40, 117,585.60 and 25,805.20

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Solution

The fourth proportional to 78,390.40, 117,585.60 and 25,805.20 is: 38,707.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.40 : 117,585.60 = 25,805.20 : x
  2. Step 2: Convert to fraction form
    78,390.40/117,585.60 = 25,805.20/x
  3. Step 3: Cross multiply
    78,390.40x = 117,585.60 × 25,805.20
  4. Step 4: Simplify right side
    78,390.40x = 3,034,319,925.12
  5. Step 5: Solve for x
    x = 3,034,319,925.12/78,390.40
  6. Step 6: Final answer
    x = 38,707.80

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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.