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Finding the Fourth Proportional to 10,281.80, 15,411.90 and 4,039.40

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Solution

The fourth proportional to 10,281.80, 15,411.90 and 4,039.40 is: 6,054.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,281.80 : 15,411.90 = 4,039.40 : x
  2. Step 2: Convert to fraction form
    10,281.80/15,411.90 = 4,039.40/x
  3. Step 3: Cross multiply
    10,281.80x = 15,411.90 × 4,039.40
  4. Step 4: Simplify right side
    10,281.80x = 62,254,828.86
  5. Step 5: Solve for x
    x = 62,254,828.86/10,281.80
  6. Step 6: Final answer
    x = 6,054.86

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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.