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Finding the Fourth Proportional to 42,750.47, 64,126.80 and 20,255.87

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Solution

The fourth proportional to 42,750.47, 64,126.80 and 20,255.87 is: 30,384.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,750.47 : 64,126.80 = 20,255.87 : x
  2. Step 2: Convert to fraction form
    42,750.47/64,126.80 = 20,255.87/x
  3. Step 3: Cross multiply
    42,750.47x = 64,126.80 × 20,255.87
  4. Step 4: Simplify right side
    42,750.47x = 1,298,944,124.32
  5. Step 5: Solve for x
    x = 1,298,944,124.32/42,750.47
  6. Step 6: Final answer
    x = 30,384.32

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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.