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Finding the Fourth Proportional to 12,931.20, 19,411.20 and 8,006.40

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Solution

The fourth proportional to 12,931.20, 19,411.20 and 8,006.40 is: 12,018.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,931.20 : 19,411.20 = 8,006.40 : x
  2. Step 2: Convert to fraction form
    12,931.20/19,411.20 = 8,006.40/x
  3. Step 3: Cross multiply
    12,931.20x = 19,411.20 × 8,006.40
  4. Step 4: Simplify right side
    12,931.20x = 155,413,831.68
  5. Step 5: Solve for x
    x = 155,413,831.68/12,931.20
  6. Step 6: Final answer
    x = 12,018.52

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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.