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Finding the Fourth Proportional to 128,043.48, 176,711.76 and 70,693.05

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Solution

The fourth proportional to 128,043.48, 176,711.76 and 70,693.05 is: 97,562.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,043.48 : 176,711.76 = 70,693.05 : x
  2. Step 2: Convert to fraction form
    128,043.48/176,711.76 = 70,693.05/x
  3. Step 3: Cross multiply
    128,043.48x = 176,711.76 × 70,693.05
  4. Step 4: Simplify right side
    128,043.48x = 12,492,293,285.27
  5. Step 5: Solve for x
    x = 12,492,293,285.27/128,043.48
  6. Step 6: Final answer
    x = 97,562.90

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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.