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Finding the Fourth Proportional to 123,970.40, 185,955.60 and 86,645.60

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Solution

The fourth proportional to 123,970.40, 185,955.60 and 86,645.60 is: 129,968.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,970.40 : 185,955.60 = 86,645.60 : x
  2. Step 2: Convert to fraction form
    123,970.40/185,955.60 = 86,645.60/x
  3. Step 3: Cross multiply
    123,970.40x = 185,955.60 × 86,645.60
  4. Step 4: Simplify right side
    123,970.40x = 16,112,234,535.36
  5. Step 5: Solve for x
    x = 16,112,234,535.36/123,970.40
  6. Step 6: Final answer
    x = 129,968.40

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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.