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Finding the Fourth Proportional to 56,748.62, 85,128.70 and 19,311.32

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Solution

The fourth proportional to 56,748.62, 85,128.70 and 19,311.32 is: 28,968.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,748.62 : 85,128.70 = 19,311.32 : x
  2. Step 2: Convert to fraction form
    56,748.62/85,128.70 = 19,311.32/x
  3. Step 3: Cross multiply
    56,748.62x = 85,128.70 × 19,311.32
  4. Step 4: Simplify right side
    56,748.62x = 1,643,947,848.31
  5. Step 5: Solve for x
    x = 1,643,947,848.31/56,748.62
  6. Step 6: Final answer
    x = 28,968.95

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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.