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Finding the Fourth Proportional to 70,908.60, 106,233.30 and 57,689.40

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Solution

The fourth proportional to 70,908.60, 106,233.30 and 57,689.40 is: 86,428.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,908.60 : 106,233.30 = 57,689.40 : x
  2. Step 2: Convert to fraction form
    70,908.60/106,233.30 = 57,689.40/x
  3. Step 3: Cross multiply
    70,908.60x = 106,233.30 × 57,689.40
  4. Step 4: Simplify right side
    70,908.60x = 6,128,535,337.02
  5. Step 5: Solve for x
    x = 6,128,535,337.02/70,908.60
  6. Step 6: Final answer
    x = 86,428.66

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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.