Home / 78,408,001.20-117,612,001.80-70,188,380.40

Finding the Fourth Proportional to 78,408,001.20, 117,612,001.80 and 70,188,380.40

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Solution

The fourth proportional to 78,408,001.20, 117,612,001.80 and 70,188,380.40 is: 105,282,570.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,408,001.20 : 117,612,001.80 = 70,188,380.40 : x
  2. Step 2: Convert to fraction form
    78,408,001.20/117,612,001.80 = 70,188,380.40/x
  3. Step 3: Cross multiply
    78,408,001.20x = 117,612,001.80 × 70,188,380.40
  4. Step 4: Simplify right side
    78,408,001.20x = 8,254,995,921,943,885
  5. Step 5: Solve for x
    x = 8,254,995,921,943,885/78,408,001.20
  6. Step 6: Final answer
    x = 105,282,570.60

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Similar ratio
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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.