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Finding the Fourth Proportional to 101,356, 139,875.60 and 56,644

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Solution

The fourth proportional to 101,356, 139,875.60 and 56,644 is: 78,171.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,356 : 139,875.60 = 56,644 : x
  2. Step 2: Convert to fraction form
    101,356/139,875.60 = 56,644/x
  3. Step 3: Cross multiply
    101,356x = 139,875.60 × 56,644
  4. Step 4: Simplify right side
    101,356x = 7,923,113,486.40
  5. Step 5: Solve for x
    x = 7,923,113,486.40/101,356
  6. Step 6: Final answer
    x = 78,171.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.