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Finding the Fourth Proportional to 78,820.20, 118,230.30 and 77,783.40

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Solution

The fourth proportional to 78,820.20, 118,230.30 and 77,783.40 is: 116,675.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,820.20 : 118,230.30 = 77,783.40 : x
  2. Step 2: Convert to fraction form
    78,820.20/118,230.30 = 77,783.40/x
  3. Step 3: Cross multiply
    78,820.20x = 118,230.30 × 77,783.40
  4. Step 4: Simplify right side
    78,820.20x = 9,196,354,717.02
  5. Step 5: Solve for x
    x = 9,196,354,717.02/78,820.20
  6. Step 6: Final answer
    x = 116,675.10

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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.