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Finding the Fourth Proportional to 72,890.70, 109,328.76 and 20,300.64

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Solution

The fourth proportional to 72,890.70, 109,328.76 and 20,300.64 is: 30,448.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,890.70 : 109,328.76 = 20,300.64 : x
  2. Step 2: Convert to fraction form
    72,890.70/109,328.76 = 20,300.64/x
  3. Step 3: Cross multiply
    72,890.70x = 109,328.76 × 20,300.64
  4. Step 4: Simplify right side
    72,890.70x = 2,219,443,798.41
  5. Step 5: Solve for x
    x = 2,219,443,798.41/72,890.70
  6. Step 6: Final answer
    x = 30,448.93

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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.