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Finding the Fourth Proportional to 215,701.50, 297,690.30 and 129,688.56

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Solution

The fourth proportional to 215,701.50, 297,690.30 and 129,688.56 is: 178,983.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,701.50 : 297,690.30 = 129,688.56 : x
  2. Step 2: Convert to fraction form
    215,701.50/297,690.30 = 129,688.56/x
  3. Step 3: Cross multiply
    215,701.50x = 297,690.30 × 129,688.56
  4. Step 4: Simplify right side
    215,701.50x = 38,607,026,332.97
  5. Step 5: Solve for x
    x = 38,607,026,332.97/215,701.50
  6. Step 6: Final answer
    x = 178,983.58

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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.