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Finding the Fourth Proportional to 145,309.40, 217,920.90 and 56,511.80

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Solution

The fourth proportional to 145,309.40, 217,920.90 and 56,511.80 is: 84,750.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,309.40 : 217,920.90 = 56,511.80 : x
  2. Step 2: Convert to fraction form
    145,309.40/217,920.90 = 56,511.80/x
  3. Step 3: Cross multiply
    145,309.40x = 217,920.90 × 56,511.80
  4. Step 4: Simplify right side
    145,309.40x = 12,315,102,316.62
  5. Step 5: Solve for x
    x = 12,315,102,316.62/145,309.40
  6. Step 6: Final answer
    x = 84,750.90

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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.