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Finding the Fourth Proportional to 12,903.80, 19,355.70 and 9,831.80

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Solution

The fourth proportional to 12,903.80, 19,355.70 and 9,831.80 is: 14,747.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,903.80 : 19,355.70 = 9,831.80 : x
  2. Step 2: Convert to fraction form
    12,903.80/19,355.70 = 9,831.80/x
  3. Step 3: Cross multiply
    12,903.80x = 19,355.70 × 9,831.80
  4. Step 4: Simplify right side
    12,903.80x = 190,301,371.26
  5. Step 5: Solve for x
    x = 190,301,371.26/12,903.80
  6. Step 6: Final answer
    x = 14,747.70

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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.