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Finding the Fourth Proportional to 76,689.80, 114,966.30 and 29,931.80

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Solution

The fourth proportional to 76,689.80, 114,966.30 and 29,931.80 is: 44,871.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,689.80 : 114,966.30 = 29,931.80 : x
  2. Step 2: Convert to fraction form
    76,689.80/114,966.30 = 29,931.80/x
  3. Step 3: Cross multiply
    76,689.80x = 114,966.30 × 29,931.80
  4. Step 4: Simplify right side
    76,689.80x = 3,441,148,298.34
  5. Step 5: Solve for x
    x = 3,441,148,298.34/76,689.80
  6. Step 6: Final answer
    x = 44,871.00

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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.