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Finding the Fourth Proportional to 78,312.20, 117,479.10 and 28,380.20

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Solution

The fourth proportional to 78,312.20, 117,479.10 and 28,380.20 is: 42,574.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,312.20 : 117,479.10 = 28,380.20 : x
  2. Step 2: Convert to fraction form
    78,312.20/117,479.10 = 28,380.20/x
  3. Step 3: Cross multiply
    78,312.20x = 117,479.10 × 28,380.20
  4. Step 4: Simplify right side
    78,312.20x = 3,334,080,353.82
  5. Step 5: Solve for x
    x = 3,334,080,353.82/78,312.20
  6. Step 6: Final answer
    x = 42,574.21

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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.