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Finding the Fourth Proportional to 255,790.80, 383,686.20 and 78,298.20

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Solution

The fourth proportional to 255,790.80, 383,686.20 and 78,298.20 is: 117,447.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,790.80 : 383,686.20 = 78,298.20 : x
  2. Step 2: Convert to fraction form
    255,790.80/383,686.20 = 78,298.20/x
  3. Step 3: Cross multiply
    255,790.80x = 383,686.20 × 78,298.20
  4. Step 4: Simplify right side
    255,790.80x = 30,041,938,824.84
  5. Step 5: Solve for x
    x = 30,041,938,824.84/255,790.80
  6. Step 6: Final answer
    x = 117,447.30

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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.