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Finding the Fourth Proportional to 14,911.18, 20,555.76 and 10,421

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Solution

The fourth proportional to 14,911.18, 20,555.76 and 10,421 is: 14,365.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,911.18 : 20,555.76 = 10,421 : x
  2. Step 2: Convert to fraction form
    14,911.18/20,555.76 = 10,421/x
  3. Step 3: Cross multiply
    14,911.18x = 20,555.76 × 10,421
  4. Step 4: Simplify right side
    14,911.18x = 214,211,574.96
  5. Step 5: Solve for x
    x = 214,211,574.96/14,911.18
  6. Step 6: Final answer
    x = 14,365.84

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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.