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Finding the Fourth Proportional to 28,209.78, 42,152.76 and 21,509.46

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Solution

The fourth proportional to 28,209.78, 42,152.76 and 21,509.46 is: 32,140.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,209.78 : 42,152.76 = 21,509.46 : x
  2. Step 2: Convert to fraction form
    28,209.78/42,152.76 = 21,509.46/x
  3. Step 3: Cross multiply
    28,209.78x = 42,152.76 × 21,509.46
  4. Step 4: Simplify right side
    28,209.78x = 906,683,105.11
  5. Step 5: Solve for x
    x = 906,683,105.11/28,209.78
  6. Step 6: Final answer
    x = 32,140.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.