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Finding the Fourth Proportional to 18,985.40, 28,472.72 and 7,878.35

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Solution

The fourth proportional to 18,985.40, 28,472.72 and 7,878.35 is: 11,815.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.40 : 28,472.72 = 7,878.35 : x
  2. Step 2: Convert to fraction form
    18,985.40/28,472.72 = 7,878.35/x
  3. Step 3: Cross multiply
    18,985.40x = 28,472.72 × 7,878.35
  4. Step 4: Simplify right side
    18,985.40x = 224,317,871.86
  5. Step 5: Solve for x
    x = 224,317,871.86/18,985.40
  6. Step 6: Final answer
    x = 11,815.29

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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.