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Finding the Fourth Proportional to 212,894.51, 318,980.27 and 128,477.28

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Solution

The fourth proportional to 212,894.51, 318,980.27 and 128,477.28 is: 192,497.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,894.51 : 318,980.27 = 128,477.28 : x
  2. Step 2: Convert to fraction form
    212,894.51/318,980.27 = 128,477.28/x
  3. Step 3: Cross multiply
    212,894.51x = 318,980.27 × 128,477.28
  4. Step 4: Simplify right side
    212,894.51x = 40,981,717,463.27
  5. Step 5: Solve for x
    x = 40,981,717,463.27/212,894.51
  6. Step 6: Final answer
    x = 192,497.77

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1.5x scale

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.