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Finding the Fourth Proportional to 98,603.20, 147,904.80 and 78,920.20

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Solution

The fourth proportional to 98,603.20, 147,904.80 and 78,920.20 is: 118,380.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,603.20 : 147,904.80 = 78,920.20 : x
  2. Step 2: Convert to fraction form
    98,603.20/147,904.80 = 78,920.20/x
  3. Step 3: Cross multiply
    98,603.20x = 147,904.80 × 78,920.20
  4. Step 4: Simplify right side
    98,603.20x = 11,672,676,396.96
  5. Step 5: Solve for x
    x = 11,672,676,396.96/98,603.20
  6. Step 6: Final answer
    x = 118,380.30

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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.