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Finding the Fourth Proportional to 78,345.40, 117,518.10 and 38,979.40

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Solution

The fourth proportional to 78,345.40, 117,518.10 and 38,979.40 is: 58,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,345.40 : 117,518.10 = 38,979.40 : x
  2. Step 2: Convert to fraction form
    78,345.40/117,518.10 = 38,979.40/x
  3. Step 3: Cross multiply
    78,345.40x = 117,518.10 × 38,979.40
  4. Step 4: Simplify right side
    78,345.40x = 4,580,785,027.14
  5. Step 5: Solve for x
    x = 4,580,785,027.14/78,345.40
  6. Step 6: Final answer
    x = 58,469.10

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1.5x scale

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.