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Finding the Fourth Proportional to 76,406.40, 105,436.80 and 42,871.68

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Solution

The fourth proportional to 76,406.40, 105,436.80 and 42,871.68 is: 59,160.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,406.40 : 105,436.80 = 42,871.68 : x
  2. Step 2: Convert to fraction form
    76,406.40/105,436.80 = 42,871.68/x
  3. Step 3: Cross multiply
    76,406.40x = 105,436.80 × 42,871.68
  4. Step 4: Simplify right side
    76,406.40x = 4,520,252,749.82
  5. Step 5: Solve for x
    x = 4,520,252,749.82/76,406.40
  6. Step 6: Final answer
    x = 59,160.66

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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.