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Finding the Fourth Proportional to 56,947.70, 85,421.55 and 20,011.70

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Solution

The fourth proportional to 56,947.70, 85,421.55 and 20,011.70 is: 30,017.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,947.70 : 85,421.55 = 20,011.70 : x
  2. Step 2: Convert to fraction form
    56,947.70/85,421.55 = 20,011.70/x
  3. Step 3: Cross multiply
    56,947.70x = 85,421.55 × 20,011.70
  4. Step 4: Simplify right side
    56,947.70x = 1,709,430,432.14
  5. Step 5: Solve for x
    x = 1,709,430,432.14/56,947.70
  6. Step 6: Final answer
    x = 30,017.55

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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.