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Finding the Fourth Proportional to 76,706.84, 105,848.70 and 42,712.76

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Solution

The fourth proportional to 76,706.84, 105,848.70 and 42,712.76 is: 58,939.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,706.84 : 105,848.70 = 42,712.76 : x
  2. Step 2: Convert to fraction form
    76,706.84/105,848.70 = 42,712.76/x
  3. Step 3: Cross multiply
    76,706.84x = 105,848.70 × 42,712.76
  4. Step 4: Simplify right side
    76,706.84x = 4,521,090,119.41
  5. Step 5: Solve for x
    x = 4,521,090,119.41/76,706.84
  6. Step 6: Final answer
    x = 58,939.86

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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.