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Finding the Fourth Proportional to 78,483.40, 117,725.10 and 39,117.40

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Solution

The fourth proportional to 78,483.40, 117,725.10 and 39,117.40 is: 58,676.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,483.40 : 117,725.10 = 39,117.40 : x
  2. Step 2: Convert to fraction form
    78,483.40/117,725.10 = 39,117.40/x
  3. Step 3: Cross multiply
    78,483.40x = 117,725.10 × 39,117.40
  4. Step 4: Simplify right side
    78,483.40x = 4,605,099,826.74
  5. Step 5: Solve for x
    x = 4,605,099,826.74/78,483.40
  6. Step 6: Final answer
    x = 58,676.10

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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.