Home / 78,090.40-107,763.44-42,280.12

Finding the Fourth Proportional to 78,090.40, 107,763.44 and 42,280.12

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Solution

The fourth proportional to 78,090.40, 107,763.44 and 42,280.12 is: 58,345.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,090.40 : 107,763.44 = 42,280.12 : x
  2. Step 2: Convert to fraction form
    78,090.40/107,763.44 = 42,280.12/x
  3. Step 3: Cross multiply
    78,090.40x = 107,763.44 × 42,280.12
  4. Step 4: Simplify right side
    78,090.40x = 4,556,251,174.81
  5. Step 5: Solve for x
    x = 4,556,251,174.81/78,090.40
  6. Step 6: Final answer
    x = 58,345.86

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1.5x scale

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.