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Finding the Fourth Proportional to 18,871.40, 28,307.02 and 4,831.40

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Solution

The fourth proportional to 18,871.40, 28,307.02 and 4,831.40 is: 7,247.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.40 : 28,307.02 = 4,831.40 : x
  2. Step 2: Convert to fraction form
    18,871.40/28,307.02 = 4,831.40/x
  3. Step 3: Cross multiply
    18,871.40x = 28,307.02 × 4,831.40
  4. Step 4: Simplify right side
    18,871.40x = 136,762,536.43
  5. Step 5: Solve for x
    x = 136,762,536.43/18,871.40
  6. Step 6: Final answer
    x = 7,247.08

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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.