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Finding the Fourth Proportional to 101,428.80, 139,962.78 and 56,106.60

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Solution

The fourth proportional to 101,428.80, 139,962.78 and 56,106.60 is: 77,422.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,428.80 : 139,962.78 = 56,106.60 : x
  2. Step 2: Convert to fraction form
    101,428.80/139,962.78 = 56,106.60/x
  3. Step 3: Cross multiply
    101,428.80x = 139,962.78 × 56,106.60
  4. Step 4: Simplify right side
    101,428.80x = 7,852,835,712.35
  5. Step 5: Solve for x
    x = 7,852,835,712.35/101,428.80
  6. Step 6: Final answer
    x = 77,422.15

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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.