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Finding the Fourth Proportional to 76,407.64, 105,455.12 and 42,426.99

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Solution

The fourth proportional to 76,407.64, 105,455.12 and 42,426.99 is: 58,556.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,407.64 : 105,455.12 = 42,426.99 : x
  2. Step 2: Convert to fraction form
    76,407.64/105,455.12 = 42,426.99/x
  3. Step 3: Cross multiply
    76,407.64x = 105,455.12 × 42,426.99
  4. Step 4: Simplify right side
    76,407.64x = 4,474,143,109.55
  5. Step 5: Solve for x
    x = 4,474,143,109.55/76,407.64
  6. Step 6: Final answer
    x = 58,556.23

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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.