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Finding the Fourth Proportional to 156,064.64, 215,352.71 and 90,640.68

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Solution

The fourth proportional to 156,064.64, 215,352.71 and 90,640.68 is: 125,074.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,064.64 : 215,352.71 = 90,640.68 : x
  2. Step 2: Convert to fraction form
    156,064.64/215,352.71 = 90,640.68/x
  3. Step 3: Cross multiply
    156,064.64x = 215,352.71 × 90,640.68
  4. Step 4: Simplify right side
    156,064.64x = 19,519,716,364.73
  5. Step 5: Solve for x
    x = 19,519,716,364.73/156,064.64
  6. Step 6: Final answer
    x = 125,074.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.