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Finding the Fourth Proportional to 92,976.70, 128,369.64 and 71,428.07

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Solution

The fourth proportional to 92,976.70, 128,369.64 and 71,428.07 is: 98,618.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,976.70 : 128,369.64 = 71,428.07 : x
  2. Step 2: Convert to fraction form
    92,976.70/128,369.64 = 71,428.07/x
  3. Step 3: Cross multiply
    92,976.70x = 128,369.64 × 71,428.07
  4. Step 4: Simplify right side
    92,976.70x = 9,169,194,632.81
  5. Step 5: Solve for x
    x = 9,169,194,632.81/92,976.70
  6. Step 6: Final answer
    x = 98,618.20

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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.