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Finding the Fourth Proportional to 125,391, 188,086.50 and 42,285

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Solution

The fourth proportional to 125,391, 188,086.50 and 42,285 is: 63,427.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,391 : 188,086.50 = 42,285 : x
  2. Step 2: Convert to fraction form
    125,391/188,086.50 = 42,285/x
  3. Step 3: Cross multiply
    125,391x = 188,086.50 × 42,285
  4. Step 4: Simplify right side
    125,391x = 7,953,237,652.50
  5. Step 5: Solve for x
    x = 7,953,237,652.50/125,391
  6. Step 6: Final answer
    x = 63,427.50

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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.